Submission #628990

#	Time	Username	Problem	Language	Result	Execution time	Memory
628990		BeanZ	Genetics (BOI18_genetics)	C++14	100 / 100	591 ms	296788 KiB

genetics

#include <bits/stdc++.h>
using namespace std;
 
const int M = 4105, N = 4105;
 
int m, n, x, sum[M][N][4];
char s[M][N];
vector<int> ve;
random_device rd;
mt19937_64 mt(rd());
 
int convert(char c) {
    switch (c) {
        case 'A': return 0;
        case 'T': return 1;
        case 'G': return 2;
        case 'C': return 3;
        default:  return 0;
    }
}
 
bool check(int ind, int pos) {
    int cnt = (pos - (ind <= pos)) * x;
    for (int i = 1; i <= n; i++) {
        cnt -= sum[pos][i][convert(s[ind][i])];
    }
    return cnt == 0;
}
 
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> m >> n >> x;
    for (int i = 1; i <= m; i++) {
        cin >> (s[i] + 1);
        for (int j = 1; j <= n; j++) {
            int cur = convert(s[i][j]);
            for (int k = 0; k < 4; k++) {
                sum[i][j][k] = sum[i - 1][j][k] + (cur != k);
            }
        }
        ve.push_back(m + 1 - i);
    }
    shuffle(ve.begin() + 1, ve.end(), mt);
    for (int i = 1; i <= m; i++) {
        bool chk = true;
        for (int &v : ve) {
            if (!check(i, v)) {
                chk = false;
                break;
            }
        }
        if (chk) {
            return cout << i, 0;
        }
    }
}

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