Sanalista

input/code.cpp: In function 'int main()':
input/code.cpp:19:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j = 0; j < w.length(); j++){
                         ~~^~~~~~~~~~~~

#include <iostream>
#include <string>
#include <map>

using namespace std;

int main(){
    int n, o = 0;
    cin >> n;
    string w;
    for (int i = 0; i < n; i++){
        bool b = true;
        cin >> w;
        if(w.length() % 2 != 0){
            continue;
        }

        map<char, int> a;
        for (int j = 0; j < w.length(); j++){
            char c = w[j];
            a[c] += 1;
        }

        for (auto const& x : a){
            if(x.second % 2 != 0){
                b = false;
                break;
            }
        }
        if(b) o++;
    }
    cout << o;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED