Test results - Codility

Tasks Details

easy

1. PermCheck

Check whether array A is a permutation.

Task Score

100%

Correctness

100%

Performance

100%

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

A permutation is a sequence containing each element from 1 to N once, and only once.

For example, array A such that:

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

is a permutation, but array A such that:

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

is not a permutation, because value 2 is missing.

The goal is to check whether array A is a permutation.

Write a function:

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

that, given an array A, returns 1 if array A is a permutation and 0 if it is not.

For example, given array A such that:

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

the function should return 1.

Given array A such that:

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

the function should return 0.

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..1,000,000,000].

Solution

Programming language used Java 8

Time spent on task 15 minutes

Notes

not defined yet

Task timeline

Code: 22:48:40 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
    }
}

Code: 22:48:46 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        
        
    }
}

Code: 22:49:16 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
    }
}

Code: 22:49:27 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        for 
        
    }
}

Code: 22:52:26 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        for ()
        
    }
}

Code: 22:52:43 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        for (int i=0 ; i<A.length; i++){
            
        }
        
    }
}

Code: 22:53:54 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        for (int i=0 ; i<A.length; i++){
            if()
        }
        
    }
}

Code: 22:54:07 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        int value=0;
        
        for (int i=0 ; i<A.length; i++){
            
        }
        
    }
}

Code: 22:54:30 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            int value = A[i];
            if(value >0){
                
            }
        }
        
    }
}

Code: 22:54:46 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            int value = A[i];
            if(value >0){
                check[value] = true;
            }
        }
        
    }
}

Code: 22:55:03 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            int value = A[i];
            if(value >0 && value<check.len){
                check[value] = true;
            }
        }
        
    }
}

Code: 22:55:13 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            int value = A[i];
            if(value >0 && value<check.length){
                check[value] = true;
            }
        }
        
    }
}

Code: 22:55:26 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            int value = A[i];
            if(value >0 && value<check.length){
                check[value] = true;
            }
        }
        
        
        
    }
}

Code: 22:55:57 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            check[]
        }
        
        
        
    }
}

Code: 22:56:07 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            check[A[i]] = true;
        }
        
        
        
    }
}

Code: 22:56:17 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            check[A[i]] = true;
        }
        
        for (int i=1 ; )
        
        
    }
}

Code: 22:56:39 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            check[A[i]] = true;
        }
        
        for (int i=1 ; i<check.length ; i++){
            
        }
        
        
    }
}

Code: 22:56:58 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            check[A[i]] = true;
        }
        
        for (int i=1 ; i<check.length ; i++){
            if( check[i] == false ){
                
            }
        }
        
        
    }
}

Code: 22:57:22 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            check[A[i]] = true;
        }
        
        for (int i=1 ; i<check.length ; i++){
            if( check[i] == false ){
                return 0;
            }
        }
        return 1;
        
        
    }
}

Code: 22:57:23 UTC, java, verify, result: Failed

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            check[A[i]] = true;
        }
        
        for (int i=1 ; i<check.length ; i++){
            if( check[i] == false ){
                return 0;
            }
        }
        return 1;
        
        
    }
}

Analysis

expand all Example tests

▶

example1
the first example test

✔

0.004 s

▶

example2
the second example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.004 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
	at Solution.solution(Solution.java:14)
	at Exec.run(exec.java:46)
	at Exec.main(exec.java:31)

Code: 23:02:12 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            
            check[A[i]] = true;
        }
        
        for (int i=1 ; i<check.length ; i++){
            if( check[i] == false ){
                return 0;
            }
        }
        return 1;
        
        
    }
}

Code: 23:02:35 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            if(A[i] > A.length)
            check[A[i]] = true;
            
        }
        
        for (int i=1 ; i<check.length ; i++){
            if( check[i] == false ){
                return 0;
            }
        }
        return 1;
        
        
    }
}

Code: 23:02:42 UTC, java, verify, result: Passed

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            if(A[i] > A.length){
                return 0;
            }
            check[A[i]] = true;
            
        }
        
        for (int i=1 ; i<check.length ; i++){
            if( check[i] == false ){
                return 0;
            }
        }
        return 1;
        
        
    }
}

Analysis

expand all Example tests

▶

example1
the first example test

✔

0.004 s

▶

example2
the second example test

✔

0.004 s

Code: 23:02:56 UTC, java, verify, result: Passed

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// 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) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            if(A[i] > A.length){
                return 0;
            }
            check[A[i]] = true;
            
        }
        
        for (int i=1 ; i<check.length ; i++){
            if( check[i] == false ){
                return 0;
            }
        }
        return 1;
        
        
    }
}

Analysis

expand all Example tests

▶

example1
the first example test

✔

0.008 s

▶

example2
the second example test

✔

0.004 s

Code: 23:03:00 UTC, java, final, score: 100

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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");

class Solution {
    public int solution(int[] A) {
        // write your code in Java SE 8
        boolean check[] = new boolean[A.length+1];
        
        
        for (int i=0 ; i<A.length; i++){
            if(A[i] > A.length){
                return 0;
            }
            check[A[i]] = true;
            
        }
        
        for (int i=1 ; i<check.length ; i++){
            if( check[i] == false ){
                return 0;
            }
        }
        return 1;
        
        
    }
}

Analysis summary

The solution obtained perfect score.

Analysis

Detected time complexity:

O(N) or O(N * log(N))

expand all Example tests

▶

example1
the first example test

✔

0.004 s

▶

example2
the second example test

✔

0.004 s

expand all Correctness tests

▶

extreme_min_max
single element with minimal/maximal value

✔

0.004 s

▶

single
single element

✔

0.004 s

▶

double
two elements

✔

0.004 s

▶

antiSum1
total sum is correct, but it is not a permutation, N <= 10

✔

0.004 s

▶

small_permutation
permutation + one element occurs twice, N = ~100

✔

0.004 s

▶

permutations_of_ranges
permutations of sets like [2..100] for which the anwsers should be false

✔

0.008 s

0.004 s

expand all Performance tests

▶

medium_permutation
permutation + few elements occur twice, N = ~10,000

✔

0.028 s

▶

antiSum2
total sum is correct, but it is not a permutation, N = ~100,000

✔

0.244 s

▶

large_not_permutation
permutation + one element occurs three times, N = ~100,000

✔

0.248 s

0.244 s

▶

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

✔

0.244 s

▶

extreme_values
all the same values, N = ~100,000

✔

0.004 s

0.152 s

0.004 s

▶

various_permutations
all sequences are permutations

✔

0.004 s

0.028 s

0.244 s