Sanalista

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

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

	int n;
	cin >> n;
	int r = 0;
	for (int i = 0; i < n; ++i) {
		string s;
		cin >> s;
		vector<int> cnt(256);
		for (auto& c : s)
			cnt[c]++;
		bool fail = false;
		for (int j = 'a'; j <= 'z'; ++j)
			if (cnt[j] % 2 != 0)
				fail = true;
		if (!fail)
			r++;
	}
	cout << r << '\n';
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED