Sanalista

#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main() {
    int count = 0;
    string str = "";
    int ans = 0;
    cin >> count;
    for(int i = 0; i < count; i++) {
        cin >> str;
        for(long long unsigned int z = 0; z < 30; z++) {
            sort(str.begin(), str.end());
            if(str[0] == str[1]) {
                str.erase(0, 2);
            }
        }
        if(str.string::length() == 0) ans++;
    }
    cout << ans;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED