Submission #671264

#	Time	Username	Problem	Language	Result	Execution time	Memory
671264		mdn2002	Cop and Robber (BOI14_coprobber)	C++14	30 / 100	3066 ms	7108 KiB

coprobber

#include<bits/stdc++.h>
using namespace std;
int n , iswin [502][502][3] , nxt [502][502][3] , cur;
bool a [500][500];
int start(int N, bool A [500][500])
{
    n = N;
    for ( int i = 0 ; i < n ; i ++ )
    {
        for ( int j = 0 ; j < n ; j ++ ) a [i][j] = A [i][j];
        iswin [i][i][0] = 1;
        iswin [i][i][1] = 1;
    }

    while ( true )
    {
        int did = 0;
        for ( int i = 0 ; i < n ; i ++ )
        {
            for ( int j = 0 ; j < n ; j ++ )
            {
                for ( int z = 0 ; z < 2 ; z ++ )
                {
                    if ( iswin [i][j][z] ) continue;
                    int num = 0 , all = 0;
                    for ( int k = 0 ; k < n ; k ++ )
                    {
                        int nx = i , ny = j , can = 0 , zz = z ^ 1;
                        if ( zz == 0 )
                        {
                            ny = k;
                            if ( a [j][k] ) can = 1;
                        }
                        else
                        {
                            nx = k;
                            if ( a [i][k] ) can = 1;
                        }
                        if ( zz == 1 && i == k ) can = 1;
                        if ( can == 0 ) continue;
                        all ++;
                        if ( iswin [nx][ny][zz] )
                        {
                            nxt [i][j][z] = k;
                            num ++;
                        }
                    }
                    if ( ( z == 1 && all == num ) || ( z == 0 && num ) )
                    {
                        iswin [i][j][z] = 1;
                        did = 1;
                    }
                }
            }
        }
        if ( did == 0 ) break;
    }
    for ( int i = 0 ; i < n ; i ++ )
    {
        int num = 0;
        for ( int j = 0 ; j < n ; j ++ )
        {
            if ( iswin [i][j][0] ) num ++;
        }
        if ( num == n )
        {
            cur = i;
            return i;
        }
    }
    return -1;
}


int nextMove(int R) {
    cur = nxt [cur][R][0];
    return cur;
}

/*
int main()
{
    cin >> n;
    for ( int i = 0 ; i < n ; i ++ )
    {
        for ( int j = 0 ; j < n ; j ++ ) cin >> a [i][j];
    }

    cout << start ( n , a ) << endl;
    while ( true )
    {
        int x;
        cin >> x;
        cout << ' ' << nextMove ( x ) << endl;
    }
}

*/

• Subtask 1: 0 / 16
• Subtask 2: 0 / 14
• Subtask 3: 30 / 30
• Subtask 4: 0 / 40