Submission #1059878

#	Time	Username	Problem	Language	Result	Execution time	Memory
1059878		noyancanturk	Soccer Stadium (IOI23_soccer)	C++17	25 / 100	946 ms	95680 KiB

soccer

#include "soccer.h"

#include<bits/stdc++.h>
using namespace std;

const int lim=2000;

int n;
int rowok[lim][lim],colok[lim][lim];

bitset<lim>row[lim],col[lim];

int biggest_stadium(int N, std::vector<std::vector<int>> F)
{
    n=N;
    int ans=n*n;
    for(int i=0;i<n;i++){
        int ok=1;
        for(int j=0;j<n;j++){
            if(!F[i][j])ok=0;
            rowok[i][j]|=ok;
        }
        ok=1;
        for(int j=n-1;0<=j;j--){
            if(!F[i][j])ok=0;
            rowok[i][j]|=ok;
        }ok=1;
        for(int j=0;j<n;j++){
            if(!F[j][i])ok=0;
            colok[j][i]|=ok;
        }
        ok=1;
        for(int j=n-1;0<=j;j--){
            if(!F[j][i])ok=0;
            colok[j][i]|=ok;
        }
    }
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            if((!colok[i][j]||!rowok[i][j])&&F[i][j]){
                cerr<<i<<" "<<j<<"\n";
                return 0;
            }
            ans-=F[i][j];
        }
    }
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            row[i][j]=F[i][j];
            col[i][j]=F[j][i];
        }
    }
    int rw[n][n]{},cl[n][n]{};
    for(int i=0;i<n;i++){
        row[i]=row[i].flip();
        col[i]=col[i].flip();
        for(int j=0;j<n;j++){
            rw[i][j]=(row[i]|row[j]).count()-(lim-n);
            cl[i][j]=(col[i]|col[j]).count()-(lim-n);
        }
        row[i]=row[i].flip();
        col[i]=col[i].flip();
    }
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            if(i==j)continue;
            //cerr<<i<<" "<<j<<" :: "<<rw[i][j]<<" "<<rw[j][i]<<"\n";
            if(rw[i][j]<n&&rw[j][i]<n)return 0;
            if(cl[i][j]<n&&cl[j][i]<n)return 0;
        }
    }
    return ans;
}

• Subtask 0: 0 / 0
• Subtask 1: 1.5 / 6
• Subtask 2: 2 / 8
• Subtask 3: 5.5 / 22
• Subtask 4: 4.5 / 18
• Subtask 5: 4 / 16
• Subtask 6: 7.5 / 30