Submission #1078528

#	Time	Username	Problem	Language	Result	Execution time	Memory
1078528		beaconmc	Soccer Stadium (IOI23_soccer)	C++17	25 / 100	1165 ms	243348 KiB

soccer

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


typedef long long ll;
    
#define FOR(i,x,y) for(ll i=x; i<y; i++)
#define FORNEG(i,x,y) for(ll i=x; i>y; i--)



ll prefrow[2001][2001];
ll prefcol[2001][2001];
ll grid[2001][2001];



bool checkrow(ll a, ll b, ll row){
    if (a>b) swap(a,b);

    return (prefrow[row][b] - prefrow[row][a] + grid[row][a] == 0);

}

bool checkcol(ll a, ll b, ll col){
    if (a>b) swap(a,b);

    return (prefcol[b][col] - prefcol[a][col] + grid[a][col] == 0);
}

int biggest_stadium(int N, std::vector<std::vector<int>> F)
{
    ll ans = N*N;
    FOR(i,0,N){
        FOR(j,0,N){
            grid[i][j] = F[i][j];
            ans -= F[i][j];
        }
    }
    FOR(i,0,N){
        prefrow[i][0] = F[i][0];
        FOR(j,1,N){
            prefrow[i][j] = prefrow[i][j-1] + F[i][j];
        }
    }

    FOR(j,0,N){
        prefcol[0][j] = F[0][j];
        FOR(i,1,N){
            prefcol[i][j] = prefcol[i-1][j] + F[i][j];
        }
    }

    vector<vector<ll>> special;

    FOR(i,0,N){
        FOR(j,0,N){
            vector<vector<ll>> sus = {{i-1,j}, {i+1,j}, {i,j-1}, {i,j+1}};
            if (grid[i][j] != 1){
                bool flag = 0;
                for (auto&k : sus){
                    if (0<=k[0] && k[0]<N && 0<=k[1] && k[1]<N){
                        if (grid[k[0]][k[1]]==1) flag = 1;
                    }
                }
                if (flag==1 || i==0 || i==N-1 || j==0 || j==N-1) special.push_back({i,j});
            }
        }
    }
    for (auto&X : special){
        for (auto&Y : special){

            ll i = X[0], j = X[1], k = Y[0], l= Y[1];
             if (grid[i][j]==1 || grid[k][l] == 1) continue;
            bool check1 = (checkrow(l, j, i) && checkcol(k, i, l));
            bool check2 = (checkrow(l, j, k) && checkcol(k, i, j));
            if (!check1 && !check2) 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