제출 #238951

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
238951	2020-06-13 18:26:43	dolphingarlic	PIN (CEOI10_pin)	C++14	60 / 100	163 ms	8168 KiB

pin

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#include <bits/stdc++.h>
#define FOR(i, x, y) for (int i = x; i < y; i++)
typedef long long ll;
using namespace std;
unordered_map<ll, ll> cnt[16];
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll n, d;
    cin >> n >> d;
    FOR(i, 0, n) {
        string s;
        cin >> s;
        FOR(j, 0, 16) {
            ll hsh = 0;
            FOR(k, 0, 4) if (j & (1 << k))
                hsh += (s[k] - '0' + 1) << (k * 8);
            cnt[j][hsh]++;
        }
    }
    ll ans = 0;
    FOR(i, 0, 16) {
        if (4 - __builtin_popcount(i) > d) continue;
        ll contrib = 0;
        for (pair<ll, ll> j : cnt[i])
            contrib += j.second * (j.second - 1) / 2;
        if ((d - 4 + __builtin_popcount(i)) & 1) ans -= contrib;
 
 
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• Subtask 1: 60 / 100