제출 #111918

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
111918		fredbr	Parametriziran (COCI19_parametriziran)	C++17	33 / 110	3080 ms	1840 KiB

Main

#include <bits/stdc++.h>

#pragma GCC optimize("O3", "unroll-loops")
#pragma GCC target("popcnt")

using namespace std;

int k;

struct Word {
    unsigned v[6];

    Word() = default;

    Word& operator=(string const& s) {
        for (int i = 0; i < k; i++) {
            if (s[i] == '?') v[i] = 0;
            else v[i] = 1u<<(s[i]-'a');
        }
        return *this;
    }

    inline bool ok(Word const& rhs) const {
        for (int i = 0; i < k; i++) {
            if (__builtin_popcount(v[i]^rhs.v[i]) == 2)
                return false;
        }
        return true;
    }
};

int const maxn = 50505;

Word v[maxn];

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

    int n;
    cin >> n >> k;

    for (int i = 0; i < n; i++) {
        string s;
        cin >> s;

        v[i] = s;
    }

    int ans = 0;
    for (int i = 0; i < n; i++) {
        for (int j = i+1; j < n; j++)
            ans += v[i].ok(v[j]);
    }

    cout << ans << "\n";
}

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