Sanalista

#include <bits/stdc++.h>

using namespace std;
int main(){
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  string b[n];
  int l = 0;
  for (int i = 0; i < n; i++) {
    string s;
    cin >> s;
    map<char, int> m;
    for (unsigned int j = 0; j < s.length(); j++) {
      char c = s[j];
      m.insert(pair<char, int>(c, 0));
      auto it = m.find(c);
      it->second += 1;
    }
    bool c = true;
    for (auto const& k: m) {
      if (!(k.second % 2 == 0)) {
	c = false;
	break;
      }
    }
    if (c) {
      l++;
    }
  }
  cout << l;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED