Submission #523662

#	Time	Username	Problem	Language	Result	Execution time	Memory
523662		boykut	Marriage questions (IZhO14_marriage)	C++14	66 / 100	879 ms	262148 KiB

marriage

#include <bits/stdc++.h>

using namespace std;

char dp[2002][30003];
int pref[2002][30003];
int n, m, k;

int check(int l, int r) {
	if (r - l + 1 < m) return 0;
	for (int j = 1; j <= m; j++) {
		if (pref[j][r] - pref[j][l-1] == 0)
			return 0;
	}
	return 1;
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	cin >> n >> m >> k;

	for (int i = 0; i < k; i++) {
		int a, b;
		cin >> a >> b;
		dp[b][a] = 1;
	}

	for (int j = 1; j <= m; j++) {
		for (int i = 1; i <= n; i++) {
			pref[j][i] = pref[j][i-1] + dp[j][i];
		}
	}

	long long ans = 0;
	for (int l = 1, r = 1; l <= n; l++) {
		while (r <= n && !check(l, r)) r++;
		if (r <= n) {
			ans += n - r + 1;
		}
	}
	cout << ans << '\n';

	return 0;
}

• Subtask 1: 66 / 100