Submission #603367

#	Time	Username	Problem	Language	Result	Execution time	Memory
603367		SeDunion	Rectangles (IOI19_rect)	C++17	27 / 100	671 ms	111048 KiB

rect

#include "rect.h"
#include<iostream>
#include<vector>

using namespace std;
using ll = long long;

const int N = 202;

int gr[N][N][N];
int gc[N][N][N];

ll count_rectangles(vector<vector<int>>a) {
	int n = a.size(), m = a[0].size();
	ll ans = 0;
	for (int r = 1 ; r < n - 1 ; ++ r) {
		for (int c1 = 1 ; c1 < m - 1 ; ++ c1) {
			int mx = 0;
			for (int c2 = c1 ; c2 < m - 1 ; ++ c2) {
				mx = max(mx, a[r][c2]);
				if (mx < a[r][c1 - 1] && mx < a[r][c2 + 1]) {
					gr[r][c1][c2] = 1;
				}
			}
		}
	}
	for (int c = 1 ; c < m - 1 ; ++ c) {
		for (int r1 = 1 ; r1 < n - 1 ; ++ r1) {
			int mx = 0;
			for (int r2 = r1 ; r2 < n - 1 ; ++ r2) {
				mx = max(mx, a[r2][c]);
				if (mx < a[r1 - 1][c] && mx < a[r2 + 1][c]) {
					gc[c][r1][r2] = 1;
				}
			}
		}
	}
	for (int r = 1 ; r < n - 1 ; ++ r) {
		for (int c1 = 1 ; c1 < m - 1 ; ++ c1) {
			for (int c2 = c1 ; c2 < m - 1 ; ++ c2) {
				gr[r][c1][c2] += gr[r-1][c1][c2];
			}
		}
	}
	for (int c = 1 ; c < m - 1 ; ++ c) {
		for (int r1 = 1 ; r1 < n - 1 ; ++ r1) {
			for (int r2 = r1 ; r2 < n - 1 ; ++ r2) {
				gc[c][r1][r2] += gc[c-1][r1][r2];
			}
		}
	}
	for (int r1 = 1 ; r1 < n - 1 ; ++ r1) {
		for (int r2 = r1 ; r2 < n - 1 ; ++ r2) {
			for (int c1 = 1 ; c1 < m - 1 ; ++ c1) {
				for (int c2 = c1 ; c2 < m - 1; ++ c2) {
					int sr = gr[r2][c1][c2] - gr[r1-1][c1][c2];
					int sc = gc[c2][r1][r2] - gc[c1-1][r1][r2];
					if (sr == r2 - r1 + 1 && sc == c2 - c1 + 1) {
						ans++;
					}
				}
			}
		}
	}
	return ans;
}

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