Test results - Codility

Tasks Details

easy

1. Brackets

Determine whether a given string of parentheses (multiple types) is properly nested.

Task Score

100%

Correctness

100%

Performance

100%

A string S consisting of N characters is considered to be properly nested if any of the following conditions is true:

S is empty;

S has the form "(U)" or "[U]" or "{U}" where U is a properly nested string;

S has the form "VW" where V and W are properly nested strings.

For example, the string "{[()()]}" is properly nested but "([)()]" is not.

Write a function:

int solution(string &S);

that, given a string S consisting of N characters, returns 1 if S is properly nested and 0 otherwise.

For example, given S = "{[()()]}", the function should return 1 and given S = "([)()]", the function should return 0, as explained above.

Write an efficient algorithm for the following assumptions:

N is an integer within the range [0..200,000];

string S is made only of the following characters: '(', '{', '[', ']', '}' and/or ')'.

Solution

Programming language used C++

Time spent on task 14 minutes

Notes

not defined yet

Task timeline

Code: 12:58:00 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(String S) {
        // write your code in Java SE 8
    }
}

Code: 12:58:35 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    
    return res;
}

Code: 12:58:56 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;
    
    return res;
}

Code: 12:59:11 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    
    return res;
}

Code: 12:59:28 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S.length)
    return res;
}

Code: 13:00:00 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<str)
    return res;
}

Code: 13:00:11 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        
    }
    return res;
}

Code: 13:00:27 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='')
    }
    return res;
}

Code: 13:00:40 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(')
    }
    return res;
}

Code: 13:01:06 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='')
    }
    return res;
}

Code: 13:01:36 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                res =
            }
        }
    }
    return res;
}

Code: 13:01:46 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
        }
    }
    return res;
}

Code: 13:02:30 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            if
        }
    }
    return res;
}

Code: 13:02:50 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            if(S[i] == ')' )
        }
    }
    return res;
}

Code: 13:03:42 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            s
            if(S[i] == ')' )
        }
    }
    return res;
}

Code: 13:03:52 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            st.pop
            if(S[i] == ')' )
        }
    }
    return res;
}

Code: 13:04:22 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            pop_cst.pop();
            if(S[i] == ')' )
        }
    }
    return res;
}

Code: 13:04:34 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' )
        }
    }
    return res;
}

Code: 13:05:04 UTC, cpp, autosave

show code in pop-up

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' && char_last !='')
        }
    }
    return res;
}

Code: 13:05:19 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' && char_last !='(') return 0;
            else if
        }
    }
    return res;
}

Code: 13:05:32 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if
        }
    }
    return res;
}

Code: 13:05:49 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == ']' && char_last !='[')
        }
    }
    return res;
}

Code: 13:06:14 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    return res;
}

Code: 13:06:37 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(stack.isEmpty()){
        res = 1;
    }
    return res;
}

Code: 13:06:46 UTC, cpp, verify, result: Failed

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<strlen(S); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(stack.isEmpty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Analysis

Compile error

func.cpp: In function 'int solution(std::__cxx11::string&)':
func.cpp:14:28: error: cannot convert 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'const char*' for argument '1' to 'size_t strlen(const char*)'
     for(int i=0; i<strlen(S); i++){
                            ^
func.cpp:15:41: error: lvalue required as left operand of assignment
         if(S[i]='(' || S[i]='[' || S[i]='{'){
                                         ^~~
func.cpp:21:13: error: 'char_last' was not declared in this scope
             char_last = st.pop();
             ^~~~~~~~~
func.cpp:31:13: error: missing template arguments before '.' token
     if(stack.isEmpty()){
             ^

Code: 13:07:57 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S./si; i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(stack.isEmpty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Code: 13:08:07 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S.size(); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(stack.isEmpty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Code: 13:08:33 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    if(S.empty()){
        return 1;
    }
    for(int i=0; i<S.size(); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(stack.isEmpty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Code: 13:08:43 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    if(S.empty()){
        return 1;
    }
    
    for(int i=0; i<S.size(); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(stack.isEmpty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Code: 13:09:23 UTC, cpp, autosave

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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 31 32 33 34 35 36 37

// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S.size(); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char_last = st.pop();
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(stack.isEmpty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Code: 13:09:46 UTC, cpp, autosave

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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 31 32 33 34 35 36 37

// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S.size(); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char char_last = st.pop();
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(stack.isEmpty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Code: 13:10:08 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S.size(); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char char_last = st.top();
            st.pop();
            
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(stack.isEmpty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Code: 13:10:17 UTC, cpp, verify, result: Failed

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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 31 32 33 34 35 36 37 38 39

// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S.size(); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char char_last = st.top();
            st.pop();
            
            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(stack.isEmpty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Analysis

Compile error

func.cpp: In function 'int solution(std::__cxx11::string&)':
func.cpp:14:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<S.size(); i++){
                  ~^~~~~~~~~
func.cpp:15:41: error: lvalue required as left operand of assignment
         if(S[i]='(' || S[i]='[' || S[i]='{'){
                                         ^~~
func.cpp:33:13: error: missing template arguments before '.' token
     if(stack.isEmpty()){
             ^

Code: 13:10:33 UTC, cpp, autosave

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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 31 32 33 34 35 36 37 38 39

// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S.size(); i++){
        if(S[i]='(' || S[i]='[' || S[i]='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char char_last = st.top();
            st.pop();

            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(st.isEmpty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Code: 13:10:52 UTC, cpp, verify, result: Failed

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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 31 32 33 34 35 36 37 38 39

// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S.size(); i++){
        if(S[i]=='(' || S[i]=='[' || S[i]=='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char char_last = st.top();
            st.pop();

            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(st.isEmpty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Analysis

Compile error

func.cpp: In function 'int solution(std::__cxx11::string&)':
func.cpp:14:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<S.size(); i++){
                  ~^~~~~~~~~
func.cpp:33:11: error: 'class std::stack<char>' has no member named 'isEmpty'; did you mean 'empty'?
     if(st.isEmpty()){
           ^~~~~~~

Code: 13:11:03 UTC, cpp, autosave

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// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S.size(); i++){
        if(S[i]=='(' || S[i]=='[' || S[i]=='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char char_last = st.top();
            st.pop();

            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(st.empty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Code: 13:11:04 UTC, cpp, verify, result: Passed

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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 31 32 33 34 35 36 37 38 39

// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S.size(); i++){
        if(S[i]=='(' || S[i]=='[' || S[i]=='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char char_last = st.top();
            st.pop();

            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(st.empty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Analysis

expand all Example tests

▶

example1
example test 1

✔

0.001 s

▶

example2
example test 2

✔

0.001 s

Code: 13:11:13 UTC, cpp, 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

// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S.size(); i++){
        if(S[i]=='(' || S[i]=='[' || S[i]=='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char char_last = st.top();
            st.pop();

            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(st.empty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Analysis

expand all Example tests

▶

example1
example test 1

✔

0.001 s

▶

example2
example test 2

✔

0.001 s

Code: 13:11:18 UTC, cpp, 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

// you can use includes, for example:
#include <bits/stdc++.h>

using namespace std;

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(string &S) {
    // write your code in C++14 (g++ 6.2.0)
    int res;
    stack<char> st;

    for(int i=0; i<S.size(); i++){
        if(S[i]=='(' || S[i]=='[' || S[i]=='{'){
            st.push(S[i]);
        }else{
            if(st.empty()){
                return 0;
            }
            char char_last = st.top();
            st.pop();

            if(S[i] == ')' && char_last !='('){
                return 0;
            }else if(S[i] == '}' && char_last !='{'){
                return 0;
            }else if(S[i] == ']' && char_last !='['){
                return 0;
            }
        }
    }
    if(st.empty()){
        res = 1;
    }else{
        res = 0;
    }
    return res;
}

Analysis summary

The solution obtained perfect score.

Analysis

Detected time complexity:

O(N)

expand all Example tests

▶

example1
example test 1

✔

0.001 s

▶

example2
example test 2

✔

0.001 s

expand all Correctness tests

▶

negative_match
invalid structures

✔

0.001 s

▶

empty
empty string

✔

0.001 s

▶

simple_grouped
simple grouped positive and negative test, length=22

✔

0.001 s

expand all Performance tests

▶

large1
simple large positive test, 100K ('s followed by 100K )'s + )(

✔

0.004 s

0.001 s

▶

large2
simple large negative test, 10K+1 ('s followed by 10K )'s + )( + ()

✔

0.001 s

▶

large_full_ternary_tree
tree of the form T=(TTT) and depth 11, length=177K+

✔

0.004 s

▶

multiple_full_binary_trees
sequence of full trees of the form T=(TT), depths [1..10..1], with/without some brackets at the end, length=49K+

✔

0.001 s

▶

broad_tree_with_deep_paths
string of the form [TTT...T] of 300 T's, each T being '{{{...}}}' nested 200-fold, length=120K+

✔

0.004 s