Sanalista

#include <bits/stdc++.h>
#define ll long long int

using namespace std;

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int t; cin >> t;

	int ans = 0;
	while(t--)
	{
		map<char, bool> f;
		bool m = false;
		string s; cin >> s;

		for(char c : s)
		{
			if(f[c]) continue;
			f[c] = true;
			if(count(s.begin(), s.end(), c)%2!=0)
			{
				m = true; break;
			}
		}
		if(!m) ans++;
	}

	cout << ans << "\n";

	return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED