Test results - Codility

Tasks Details

easy

1. EquiLeader

Find the index S such that the leaders of the sequences A[0], A[1], ..., A[S] and A[S + 1], A[S + 2], ..., A[N - 1] are the same.

Task Score

100%

Correctness

100%

Performance

100%

A non-empty array A consisting of N integers is given.

The leader of this array is the value that occurs in more than half of the elements of A.

An equi leader is an index S such that 0 ≤ S < N − 1 and two sequences A[0], A[1], ..., A[S] and A[S + 1], A[S + 2], ..., A[N − 1] have leaders of the same value.

For example, given array A such that:

A[0] = 4 A[1] = 3 A[2] = 4 A[3] = 4 A[4] = 4 A[5] = 2

we can find two equi leaders:

0, because sequences: (4) and (3, 4, 4, 4, 2) have the same leader, whose value is 4.

2, because sequences: (4, 3, 4) and (4, 4, 2) have the same leader, whose value is 4.

The goal is to count the number of equi leaders.

Write a function:

class Solution { public int solution(int[] A); }

that, given a non-empty array A consisting of N integers, returns the number of equi leaders.

For example, given:

A[0] = 4 A[1] = 3 A[2] = 4 A[3] = 4 A[4] = 4 A[5] = 2

the function should return 2, as explained above.

Write an efficient algorithm for the following assumptions:

N is an integer within the range [1..100,000];

each element of array A is an integer within the range [−1,000,000,000..1,000,000,000].

Solution

Programming language used Java 21

Time spent on task 23 minutes

Notes

not defined yet

Code: 15:31:53 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");

class Solution {
    public int solution(int[] A) {
        // Implement your solution here
    }
}

Code: 15:36:13 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
ㅑㅡㅔ
class Solution {
    public int solution(int[] A) {
        // Implement your solution here
    }
}

Code: 15:36:30 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
        // Implement your solution here
    }
}

Code: 15:36:54 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new 
    }
}

Code: 15:37:14 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = clone(A);
    
    }
}

Code: 15:37:38 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone; 
    }
}

Code: 15:38:08 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);

    int tmpLeader = 
    }

Code: 15:38:35 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);

    int tmpLeader = copyA[A.length/2];

    for(int i=0; i<tmpLeader; i++){
        
    }



    }

Code: 15:39:03 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);

    int tmpLeader = copyA[A.length/2];

    for(int i=0; i<tmpLeader; i++){
        tmp[i] == tmpLeader
    }



    }

Code: 15:39:34 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);

    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(tmp[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>/2)



    }

Code: 15:39:45 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);

    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(tmp[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>A.length/2){
        
    }



    }

Code: 15:39:55 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);

    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>A.length/2){

    }



    }

Code: 15:40:26 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;}



    }

Code: 15:40:48 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int right = 0;
    int left = A.length

    }

Code: 15:41:18 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int right = 0;
    int left = A.length;
    int rightLeaderCnt = 0;
    int leftLeaderCnt = cntLeader

    }

Code: 15:41:49 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int right = 0;
    int left = A.length;
    int rightLeaderCnt = 0;
    int leftLeaderCnt = cntLeader;


    for(int current : A){
        right ++;
        left --;

        if(current == leader)

    }

    }

Code: 15:42:00 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int right = 0;
    int left = A.length;
    int rightLeaderCnt = 0;
    int leftLeaderCnt = cntLeader;


    for(int current : A){
        right ++;
        left --;

        if(current == leader){
            rightLeaderCnt ++;
        }

    }

    }

Code: 15:42:25 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int right = 0;
    int left = A.length;
    int rightLeaderCnt = 0;
    int leftLeaderCnt = cntLeader;


    for(int current : A){
        right ++;
        left --;

        if(current == leader){
            rightLeaderCnt ++;
            leftLeaderCnt --;
        }

        if(rightLeaderCnt == leftLeaderCnt){
            
        }

    }

    }

Code: 15:42:46 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int right = 0;
    int left = A.length;
    int rightLeaderCnt = 0;
    int leftLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        right ++;
        left --;

        if(current == leader){
            rightLeaderCnt ++;
            leftLeaderCnt --;
        }

        if(rightLeaderCnt == leftLeaderCnt){
            answer ++;
        }

    }

    }

Code: 15:48:45 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int right = 0;
    int left = A.length;
    int rightLeaderCnt = 0;
    int leftLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        right ++;
        left --;

        if(current == leader){
            rightLeaderCnt ++;
            leftLeaderCnt --;
        }

        if(rightLeaderCnt == leftLeaderCnt){
            answer ++;
        }

    }
r
    }

Code: 15:48:54 UTC, java, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int right = 0;
    int left = A.length;
    int rightLeaderCnt = 0;
    int leftLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        right ++;
        left --;

        if(current == leader){
            rightLeaderCnt ++;
            leftLeaderCnt --;
        }

        if(rightLeaderCnt == leftLeaderCnt){
            answer ++;
        }

    }
return answer;
    }
}

Analysis

expand all Example tests

▶

example
example test

✘

WRONG ANSWER
got -1 expected 2

0.008 s

WRONG ANSWER, got -1 expected 2

Code: 15:49:05 UTC, java, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int right = 0;
    int left = A.length;
    int rightLeaderCnt = 0;
    int leftLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        right ++;
        left --;

        if(current == leader){
            rightLeaderCnt ++;
            leftLeaderCnt --;
        }

        if(rightLeaderCnt == leftLeaderCnt){
            answer ++;
        }

    }
return answer;
    }
}

Analysis

expand all Example tests

▶

example
example test

✘

WRONG ANSWER
got 0 expected 2

0.004 s

WRONG ANSWER, got 0 expected 2

Code: 15:50:30 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int n = 0;
    int left = A.length;
    int rightLeaderCnt = 0;
    int leftLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        right ++;
        left --;

        if(current == leader){
            rightLeaderCnt ++;
            leftLeaderCnt --;
        }

        if(rightLeaderCnt == leftLeaderCnt){
            answer ++;
        }

    }
return answer;
    }
}

Code: 15:50:42 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        right ++;
        left --;

        if(current == leader){
            rightLeaderCnt ++;
            leftLeaderCnt --;
        }

        if(rightLeaderCnt == leftLeaderCnt){
            answer ++;
        }

    }
return answer;
    }
}

Code: 15:50:53 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt ++;
            leftLeaderCnt --;
        }

        if(rightLeaderCnt == leftLeaderCnt){
            answer ++;
        }

    }
return answer;
    }
}

Code: 15:51:05 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt --;
            leftLeaderCnt ++;
        }

        if(rightLeaderCnt == leftLeaderCnt){
            answer ++;
        }

    }
return answer;
    }
}

Code: 15:51:23 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt --;
            leftLeaderCnt ++;
        }

        if(rightLeaderCnt > right/2 == leftLeaderCnt){
            answer ++;
        }

    }
return answer;
    }
}

Code: 15:51:37 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt --;
            leftLeaderCnt ++;
        }

        if(rightLeaderCnt > right/2 && leftLeaderCnt > left/2){
            answer ++;
        }

    }
return answer;
    }
}

Code: 15:51:42 UTC, java, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return -1;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt --;
            leftLeaderCnt ++;
        }

        if(rightLeaderCnt > right/2 && leftLeaderCnt > left/2){
            answer ++;
        }

    }
return answer;
    }
}

Analysis

expand all Example tests

▶

example
example test

✘

WRONG ANSWER
got 0 expected 2

0.004 s

WRONG ANSWER, got 0 expected 2

Code: 15:52:33 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return -;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt --;
            leftLeaderCnt ++;
        }

        if(rightLeaderCnt > right/2 && leftLeaderCnt > left/2){
            answer ++;
        }

    }
return answer;
    }
}

Code: 15:52:41 UTC, java, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(A);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return 0;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt --;
            leftLeaderCnt ++;
        }

        if(rightLeaderCnt > right/2 && leftLeaderCnt > left/2){
            answer ++;
        }

    }
return answer;
    }
}

Analysis

expand all Example tests

▶

example
example test

✘

WRONG ANSWER
got 0 expected 2

0.004 s

WRONG ANSWER, got 0 expected 2

Code: 15:53:14 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(copyA);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return 0;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt --;
            leftLeaderCnt ++;
        }

        if(rightLeaderCnt > right/2 && leftLeaderCnt > left/2){
            answer ++;
        }

    }
return answer;
    }
}

Code: 15:53:15 UTC, java, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(copyA);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<tmpLeader; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return 0;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt --;
            leftLeaderCnt ++;
        }

        if(rightLeaderCnt > right/2 && leftLeaderCnt > left/2){
            answer ++;
        }

    }
return answer;
    }
}

Analysis

expand all Example tests

▶

example
example test

✘

WRONG ANSWER
got 0 expected 2

0.004 s

WRONG ANSWER, got 0 expected 2

Code: 15:53:47 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(copyA);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<ㅊ; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return 0;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt --;
            leftLeaderCnt ++;
        }

        if(rightLeaderCnt > right/2 && leftLeaderCnt > left/2){
            answer ++;
        }

    }
return answer;
    }
}

Code: 15:53:55 UTC, java, verify, result: Passed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(copyA);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<copyA.length; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return 0;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt --;
            leftLeaderCnt ++;
        }

        if(rightLeaderCnt > right/2 && leftLeaderCnt > left/2){
            answer ++;
        }

    }
return answer;
    }
}

Analysis

expand all Example tests

▶

example
example test

✔

0.008 s

Code: 15:54:02 UTC, java, verify, result: Passed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(copyA);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<copyA.length; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return 0;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt --;
            leftLeaderCnt ++;
        }

        if(rightLeaderCnt > right/2 && leftLeaderCnt > left/2){
            answer ++;
        }

    }
return answer;
    }
}

Analysis

expand all Example tests

▶

example
example test

✔

0.008 s

Code: 15:54:06 UTC, java, final, score: 100

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;
class Solution {
    public int solution(int[] A) {

    //리더찾기
    int[] copyA = new int[A.length];
    copyA = A.clone();
    Arrays.sort(copyA);
    int leader = 0;
    int tmpLeader = copyA[A.length/2];
    int cntLeader = 0;
    for(int i=0; i<copyA.length; i++){
        if(copyA[i] == tmpLeader){
            cntLeader ++;
        }
    }
    if(cntLeader>=A.length/2){
        leader = tmpLeader;
    }
    else{
        return 0;
    }


    int left = 0;
    int right = A.length;
    int leftLeaderCnt = 0;
    int rightLeaderCnt = cntLeader;
    int answer = 0;

    for(int current : A){
        left ++;
        right --;

        if(current == leader){
            rightLeaderCnt --;
            leftLeaderCnt ++;
        }

        if(rightLeaderCnt > right/2 && leftLeaderCnt > left/2){
            answer ++;
        }

    }
return answer;
    }
}

Analysis summary

The solution obtained perfect score.

Analysis

Detected time complexity:

O(N)

expand all Example tests

▶

example
example test

✔

0.004 s

expand all Correctness tests

▶

single
single element

✔

0.004 s

0.008 s

▶

double
two elements

✔

0.008 s

0.004 s

▶

simple
simple test

✔

0.008 s

▶

small_random
small random test with two values, length = ~100

✔

0.008 s

▶

small
random + 200 * [MIN_INT] + random ,length = ~300

✔

0.004 s

expand all Performance tests

▶

large_random
large random test with two values, length = ~50,000

✔

0.108 s

▶

large
random(0,1) + 50000 * [0] + random(0, 1), length = ~100,000

✔

0.168 s

▶

large_range
1, 2, ..., N, length = ~100,000

✔

0.284 s

0.004 s

▶

extreme_large
all the same values

✔

0.436 s