문제
풀이
#include <iostream>
#include <string>
#include <unordered_map>
using namespace std;
void solve(void) {
int n, l, f; cin >> n >> l >> f;
unordered_map<string, int> mp;
while (n--) {
string s; cin >> s;
mp[s.substr(l-f)]++;
}
int ans = 0;
for (auto &[_, v] : mp) ans += v / 2;
cout << ans << "\n";
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int t; cin >> t;
while (t--) solve();
return 0;
}