Submission #1043561

#	Time	Username	Problem	Language	Result	Execution time	Memory
1043561		idas	Rectangles (IOI19_rect)	C++17	25 / 100	5091 ms	102312 KiB

rect

#include "rect.h"
#include "bits/stdc++.h"
#define FOR(i, begin, end) for(int i=(begin); i<(end); i++)
#define pb push_back
#define s second
#define f first

using namespace std;
typedef pair<int, int> pii;
typedef vector<int> vi;

const int MxN=2510;
int n, m, a[MxN][MxN], mxx[MxN][MxN], mxy[MxN][MxN];

long long count_rectangles(std::vector<std::vector<int> > A) {
	n=A.size(); m=A[0].size();
	FOR(i, 0, n) FOR(j, 0, m) a[i][j]=A[i][j];

	int ans=0;
	FOR(i, 1, n-1) {
		FOR(j, 1, m-1) {
			int x=n-2, y=m-2;
			FOR(k, i, n-1) {
				// if(k>x) break;
				FOR(l, j, m-1) {
					if(l>y) break;

					if(k-1>=i) mxx[k][l]=max(mxx[k-1][l], a[k][l]);
					else mxx[k][l]=a[k][l];

					if(l-1>=j) mxy[k][l]=max(mxy[k][l-1], a[k][l]);
					else mxy[k][l]=a[k][l];

					if(a[k][l]>=a[k][j-1] || a[k][l]>=a[i-1][l]) {
						y=l-1;
						break;
					}

					bool ok=true;
					FOR(z, i, k+1) {
						ok&=mxy[z][l]<a[z][l+1];
						ok&=mxy[z][l]<a[z][j-1];
					}
					FOR(z, j, l+1) {
						ok&=mxx[k][z]<a[k+1][z];
						ok&=mxx[k][z]<a[i-1][z];
					}

					ans+=ok;
					// if(ok) {
					// 	cout << i << " " << j << " " << k << " " << l << endl;
					// 	cout << mxy[1][3] << " " << mxy[2][3] << " " << mxy[3][3] << " " << mxy[4][3] << endl;
					// 	cout << mxx[4][2] << " " << mxx[4][3] << endl;
					// }
				}
			}
		}
	}

	return ans;
}

Compilation message (stderr)

rect.cpp: In function 'long long int count_rectangles(std::vector<std::vector<int> >)':
rect.cpp:22:8: warning: unused variable 'x' [-Wunused-variable]
   22 |    int x=n-2, y=m-2;
      |        ^

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