#include<bits/stdc++.h>
using namespace std;
int n , a [502][502] , iswin [502][502][3];
int start(int n, bool a [502][502])
{
for ( int i = 0 ; i < n ; i ++ )
{
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] ) 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 ) return i;
}
return -1;
}
int nextMove(int R) {
return -1;
}
/*
int main()
{
cin >> n;
for ( int i = 0 ; i < n ; i ++ )
{
for ( int j = 0 ; j < n ; j ++ ) cin >> a [i][j];
}
start ( n , a );
}
*/
Compilation message
/usr/bin/ld: /tmp/ccU3LCu1.o: in function `main':
grader.cpp:(.text.startup+0x16c): undefined reference to `start(int, bool (*) [500])'
collect2: error: ld returned 1 exit status
