Submission #297460

#	Time	Username	Problem	Language	Result	Execution time	Memory
297460		infinite_iq	Rectangles (IOI19_rect)	C++14	0 / 100	7 ms	10624 KiB

rect

#include <bits/stdc++.h>
using namespace std ;
#define mid (l+r)/2
#define pb push_back
#define C continue 
#define lb lower_bound
typedef long long ll ;
typedef vector < int > vi ;
#include "rect.h"
int n , m ;
int a   [2509][2509] ;
int pre [2509][2509][2] ;
int Sum ( int id , int l , int r , int t ) {
        return pre [id][r][t] - ( l ? pre [id][l-1][t] : 0 ) ;
}
long long count_rectangles ( vector <vi> A ) {
        n = A .size () ;
        m = A [0] .size () ;
        for ( int i = 0 ; i < n ; i ++ ) {
                for ( int j = 0 ; j < m ; j ++ ) {
                        a [i][j] = A [i][j] ;
                }
        }
        for ( int i = 0 ; i < n ; i ++ ) {
                int crnt = 0 ;
                for ( int j = 0 ; j < m ; j ++ ) {
                        crnt += a [i][j] ;
                        pre [i][j][0] = crnt ;
                }
        }
        for ( int j = 0 ; j < m ; j ++ ) {
                int crnt = 0 ;
                for ( int i = 0 ; i < n ; i ++ ) {
                        crnt += a [i][j] ;
                        pre [j][i][1] = crnt ;
                }
        }
        ll ans = 0 ;
        for ( int i = 1 ; i < n - 1 ; i ++ ) {
                for ( int k = 1 ; k < m - 1 ; k ++ ) {
                        int l = i , r = n - 1 ;
                        while ( r - l > 1 ) {
                                if ( Sum ( k , i , mid , 1 ) == 0 ) l = mid ;
                                else r = mid ;
                        }
                        int j = l ;
                        l = k , r = m - 1 ;
                        while ( r - l > 1 ) {
                                if ( Sum ( i , k , mid , 0 ) == 0 ) l = mid ;
                                else r = mid ;
                        }
                        if ( Sum ( k - 1 , i , j , 1 ) != j - i + 1 ) C ;
                        if ( Sum ( l + 1 , i , j , 1 ) != j - i + 1 ) C ;
                        if ( Sum ( i - 1 , k , l , 0 ) != l - k + 1 ) C ;
                        if ( Sum ( j + 1 , k , l , 0 ) != l - k + 1 ) C ;
                        ans ++ ;
                }
        }
        return ans ;
}

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