# include<iostream>
# include<cstdio>
# include<cmath>
# include<algorithm>
# include<cstring>
using namespace std;
const int MAX_N = 100;
int a[MAX_N+8][MAX_N+8];
int vis[MAX_N+8][MAX_N+8];
int dis[4][2] = {{0,1},{1,0},{0,-1},{-1,0}};
int r, c;
int search( int x, int y )
{
if ( vis[x][y] != -1 )
return vis[x][y];
int t = 0;
int nx, ny;
for ( int i = 0;i < 4;i++ )
{
nx = x + dis[i][0];
ny = y + dis[i][1];
......
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