Sanalista

#include <iostream>

int main() {
  std::ios::sync_with_stdio(false);
  std::cin.tie(nullptr);

  size_t len;
  std::cin >> len;

  size_t res = 0;
  for (size_t i = 0; i < len; ++i) {
    std::string s;
    std::cin >> s;
    uint32_t pariton = 0;
    for (auto i : s) {
      pariton ^= 1 << (i - 'a');
    }
    res += !pariton;
  }
  std::cout << res << '\n';
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED