Submission #1035452

#	Time	Username	Problem	Language	Result	Execution time	Memory
1035452		Abito	Rectangles (IOI19_rect)	C++17	10 / 100	17 ms	20692 KiB

rect

#include "rect.h"
#include <bits/stdc++.h>
using namespace std;
const int N=2505;
int n,m,a[5][N],mx[N][N],p[N];
long long count_rectangles(vector<vector<int>> v){
    n=v.size();
    m=v[0].size();
    if (n<=2 || m<=2) return 0LL;
    for (int i=1;i<=n;i++) for (int j=1;j<=m;j++) a[i][j]=v[i-1][j-1];
    for (int j=2;j<m;j++) p[j]=p[j-1]+bool(a[2][j]<a[1][j] && a[2][j]<a[3][j]);
    for (int i=2;i<m;i++){
        mx[i][i]=a[2][i];
        for (int j=i+1;j<m;j++){
            mx[i][j]=max(mx[i][j-1],a[2][j]);
        }
    }
    long long ans=0;
    for (int i=2;i<m;i++) for (int j=i;j<m;j++) ans+=bool(p[j]-p[i-1]==j-i+1 && mx[i][j]<a[2][i-1] && mx[i][j]<a[2][j+1]);
    return ans;
}

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