Submission #168716

#	Time	Username	Problem	Language	Result	Execution time	Memory
168716		maruii	Cultivation (JOI17_cultivation)	C++14	5 / 100	1845 ms	504 KiB

cultivation

#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
#define ff first
#define ss second

int A[50];
pii P[2500];
int R, C, N;

bool f(int a, int b, int c, int d) {
	vector<pii> v[50];
	fill(A, A + C + 1, 0);
	for (int i = 0; i < N; ++i) {
		int x1 = P[i].ff - a, x2 = P[i].ff + b, y1 = P[i].ss - c, y2 = P[i].ss + d;
		x1 = max(1, x1);
		x2 = min(R, x2);
		y1 = max(1, y1);
		y2 = min(C, y2);
		v[x1].emplace_back(y1, y2);
		v[x2 + 1].emplace_back(-y1, y2);
	}
	int cnt = 0;
	for (int i = 1; i <= R; ++i) {
		for (auto j : v[i]) {
			if (j.ff > 0) {
				for (int k = j.ff; k <= j.ss; ++k) {
					if (!A[k]) cnt++;
					A[k]++;
				}
			}
			else {
				for (int k = -j.ff; k <= j.ss; ++k) {
					A[k]--;
					if (!A[k]) cnt--;
				}
			}
		}
		if (cnt != C) return 0;
	}
	return 1;
}

int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> R >> C >> N;
	for (int i = 0; i < N; ++i) {
		int x, y; cin >> x >> y;
		P[i] = {x, y};
	}
	int ans = R + C;
	for (int i = 0; i <= R; ++i) {
		for (int j = 0; j <= R - i; ++j) {
			for (int k = 0; k <= C; ++k) {
				for (int l = 0; l <= C - k; ++l) {
					if (f(i, j, k, l) && ans > i + j + k + l) ans = i + j + k + l;
				}
			}
		}
	}
	cout << ans;
	return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 20
• Subtask 6: 0 / 20