B bearBaby loves sleeping

#include <iostream>
#include <stdio.h>
#include <queue>
#include<cstring>
using namespace std;
typedef pair<int, int> P;
#define max_n 102
#define max_m 102
#define inf 1000000
int N,M;
int  map[max_n][max_m];
int direct[max_n][max_m];
int sx,sy;
int ans;
int dx[4]= {1,0,-1,0},dy[4]= {0,1,0,-1};

int bfs(int sx,int sy,int gx,int gy)
{
    int nx,ny;
    queue<P> Q;
    memset(direct, inf, sizeof(direct));
    Q.push(P(sx,sy));
    direct[sx][sy]=0;
    while (Q.size())
    {
        P q=Q.front();
        Q.pop();
        if (q.first==gx&&q.second==gy)
            break;
        else
        {
            for (int i=0; i<=3; i++)
            {
                nx=q.first+dx[i];
                ny=q.second+dy[i];
                if (nx<0||nx>N||ny<0||ny>M||map[nx][ny]==1||direct[nx][ny]<inf)
                    continue;
                else
                {
                    direct[nx][ny]=direct[q.first][q.second]+1;
                    Q.push(P(nx,ny));
                }
            }
        }
    }
    return direct[gx][gy];
}
int main()
{
    int gx,gy;
    scanf("%d %d",&N,&M);
    scanf("%d %d",&gx,&gy);
    for (int i=0; i<N; i++)
        for(int j = 0; j<M; j++)
        {
            scanf("%d",&map[i][j]);
        }

    ans=bfs(0, 0, gx-1, gy-1);
    printf("%d\n",ans);
    return 0;
}