Submission #340136

#	Time	Username	Problem	Language	Result	Execution time	Memory
340136		shrek12357	Rectangles (IOI19_rect)	C++14	37 / 100	5051 ms	40556 KiB

rect

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <map>
#include <set>
#include <climits>
#include <cmath>
#include <fstream>
#include <queue>
#include <stack>
#include <bitset>
#include "rect.h"
using namespace std;
#define ll long long
//cin.tie(0);ios_base::sync_with_stdio(0);

const int MAXN = 2505;
int grid[MAXN][MAXN];
int n, m;

ll ans1() {
	if (n == 1 || n == 2) {
		return 0;
	}
	int cnt = 0;
	for (int i = 1; i < m - 1; i++) {
		int cur = grid[1][i - 1];
		int mx = grid[1][i];
		for (int j = i; j < m - 1; j++) {
			mx = max(mx, grid[1][j]);
			if (grid[1][j] >= cur || grid[1][j] >= grid[0][j] || grid[1][j] >= grid[2][j]) {
				break;
			}
			if (grid[1][j] >= grid[1][j + 1] || mx >= cur || mx >= grid[1][j + 1]) {
				continue;
			}
			cnt++;
		}
	}
	return cnt;
}

ll ans2() {
	ll cnt = 0;
	for (int i = 1; i < n - 1; i++) {
		for (int j = 1; j < m - 1; j++) {
			for (int k = i; k < n - 1; k++) {
				for (int l = j; l < m - 1; l++) {
					bool bad = false;
					for (int a = i; a <= k; a++) {
						for (int b = j; b <= l; b++) {
							if (grid[a][b] >= grid[i - 1][b] || grid[a][b] >= grid[k + 1][b] || grid[a][b] >= grid[a][j - 1] || grid[a][b] >= grid[a][l + 1]) {
								bad = true;
								break;
							}
						}
						if (bad) {
							break;
						}
					}
					if (!bad) {
						cnt++;
					}
				}
			}
		}
	}
	return cnt;
}

ll count_rectangles(vector<vector<int>> a) {
	n = a.size(); m = a[0].size();
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			grid[i][j] = a[i][j];
		}
	}
	if (n <= 3) {
		return ans1();
	}
	return ans2();
}

• Subtask 1: 8 / 8
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 0 / 22
• Subtask 5: 10 / 10
• Subtask 6: 0 / 13
• Subtask 7: 0 / 28