Submission #373710

#	Time	Username	Problem	Language	Result	Execution time	Memory
373710		dolphingarlic	Genetics (BOI18_genetics)	C++14	100 / 100	287 ms	24172 KiB

genetics

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

string s[4100];
ll rnd[4100], tot, sm[4100][4];

int idx(char c) {
	if (c == 'A') return 0;
	if (c == 'G') return 1;
	if (c == 'C') return 2;
	return 3;
}

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];
		cin >> s[i];
		for (int j = 0; j < m; j++) sm[j][idx(s[i][j])] += rnd[i];
	}

	for (int i = 0; i < n; i++) {
		ll hsh = 0;
		for (int j = 0; j < m; j++) hsh += tot - sm[j][idx(s[i][j])];
		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