Submission #373706

#	Time	Username	Problem	Language	Result	Execution time	Memory
373706		dolphingarlic	Genetics (BOI18_genetics)	C++14	100 / 100	380 ms	82848 KiB

genetics

#include <bits/stdc++.h>
typedef long long ll;
using namespace std;

int idx[4100][4100];
ll rnd[4100], tot, sm[4100][4];

int main() {
    cin.tie(0)->sync_with_stdio(0);
    int n, m, k;
    cin >> n >> m >> k;
    for (int i = 0; i < n; i++) {
        rnd[i] = rand();
        tot += rnd[i];

        string s;
        cin >> s;
        for (int j = 0; j < m; j++) {
            switch (s[j]) {
                case 'A':
                    idx[i][j] = 0;
                    sm[j][0] += rnd[i];
                    break;
                case 'G':
                    idx[i][j] = 1;
                    sm[j][1] += rnd[i];
                    break;
                case 'C':
                    idx[i][j] = 2;
                    sm[j][2] += rnd[i];
                    break;
                default:
                    idx[i][j] = 3;
                    sm[j][3] += rnd[i];
            }
        }
    }

    for (int i = 0; i < n; i++) {
        ll hsh = 0;
        for (int j = 0; j < m; j++) for (int c = 0; c < 4; c++)
            if (c != idx[i][j]) hsh += sm[j][c];
        if (hsh == k * (tot - rnd[i])) return cout << i + 1, 0;
    }
    return 0;
}

• Subtask 1: 27 / 27
• Subtask 2: 19 / 19
• Subtask 3: 28 / 28
• Subtask 4: 26 / 26