90pts求调

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

int n,m,x,y,q,a[401][401],b[16001][2],c[8] = {2,-2,2,-2,-1,1,-1,1},d[8] = {1,1,-1,-1,2,2,-2,-2};

int main(){
    scanf ("%d%d%d%d", &n, &m, &x, &y);
    memset (a,0xFF,sizeof(a));
    b[1][0] = x;
    b[1][1] = y;
    a[x][y] = 0;
    q = 2;
    for (int p = 1;p < q;p++)
        for (int i = 0;i < 8;i++){
            int x1 = b[p][0] + c[i],y1 = b[p][1] + d[i];
            if (x1 > 0 && y1 > 0 && x1 <= n && y1 <= m && a[x1][y1] == -1)
                b[q][0] = x1, b[q++][1] = y1,a[x1][y1] = a[b[p][0]][b[p][1]] + 1;
        }
    for (int i = 1;i <= n;i++){
        for (int j = 1;j <= m;j++)
            printf ("%d ", a[i][j]);
        printf ("\n");
    }
}