Submission #298796

#	Time	Username	Problem	Language	Result	Execution time	Memory
298796		square1001	Rectangles (IOI19_rect)	C++14	37 / 100	1891 ms	1048580 KiB

rect

#include "rect.h"
#include <vector>
#include <algorithm>
using namespace std;
long long count_rectangles(std::vector<std::vector<int> > A) {
	const int inf = 1012345678;
	int H = A.size(), W = A[0].size();
	vector<vector<vector<bool> > > flag_row(H, vector<vector<bool> >(W + 1, vector<bool>(W + 1)));
	vector<vector<vector<bool> > > flag_col(W, vector<vector<bool> >(H + 1, vector<bool>(H + 1)));
	for(int i = 0; i < H; ++i) {
		for(int j = 1; j < W; ++j) {
			int mx = -inf;
			for(int k = j + 1; k < W; ++k) {
				mx = max(mx, A[i][k - 1]);
				flag_row[i][j][k] = (A[i][j - 1] > mx && A[i][k] > mx);
			}
		}
	}
	for(int i = 0; i < W; ++i) {
		for(int j = 1; j < H; ++j) {
			int mx = -inf;
			for(int k = j + 1; k < H; ++k) {
				mx = max(mx, A[k - 1][i]);
				flag_col[i][j][k] = (A[j - 1][i] > mx && A[k][i] > mx);
			}
		}
	}
	vector<vector<vector<int> > > sum_row(H + 1, vector<vector<int> >(W + 1, vector<int>(W + 1)));
	vector<vector<vector<int> > > sum_col(W + 1, vector<vector<int> >(H + 1, vector<int>(H + 1)));
	for(int i = 0; i < H; ++i) {
		for(int j = 1; j < W; ++j) {
			for(int k = j + 1; k < W; ++k) {
				sum_row[i + 1][j][k] = sum_row[i][j][k] + flag_row[i][j][k];
			}
		}
	}
	for(int i = 0; i < W; ++i) {
		for(int j = 1; j < H; ++j) {
			for(int k = j + 1; k < H; ++k) {
				sum_col[i + 1][j][k] = sum_col[i][j][k] + flag_col[i][j][k];
			}
		}
	}
	long long ans = 0;
	for(int xa = 1; xa < H; ++xa) {
		for(int ya = 1; ya < W; ++ya) {
			for(int xb = xa + 1; xb < H; ++xb) {
				for(int yb = ya + 1; yb < W; ++yb) {
					int sr = sum_row[xb][ya][yb] - sum_row[xa][ya][yb];
					int sc = sum_col[yb][xa][xb] - sum_col[ya][xa][xb];
					if(sr == xb - xa && sc == yb - ya) {
						++ans;
					}
				}
			}
		}
	}
	return ans;
}

• 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