全wa，但是下载数据是一样的

#include<bits/stdc++.h>
using namespace std;
const int MAXN = 410;

struct node{
    int x, y, step;
}q[MAXN * MAXN];

int n, m, x, y ,front = 1, vis[MAXN][MAXN] ,rear, d[8][2] = {{2,1},{-2,1},{-2,-1},{2,-1},{1,2},{1,-2},{-1,-2},{-1,2}};

void bfs(){
    memset(vis, -1, sizeof(vis));
    front = 1, rear = 1;
    q[rear].x = x, q[rear].y = y,q[rear].step = 0;
    vis[x][y] = 0;
    while(front <= rear){
        node u = q[front];
        front++;
        for(int i = 0; i < 8; i++){
            node t;
            t.x = u.x + d[i][0], t.y = u.y + d[i][1], t.step = u.step + 1;
            if(t.x >= 1 && t.y >= 1 && t.x <= n && t.y <= m && vis[t.x][t.y] == -1){
                vis[t.x][t.y] = u.step;
                q[++rear] = t;
            }
        }
    }
}

int main(){
    cin >> n >> m >> x >> y;
    bfs();
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            printf("%-5d",vis[i][j]);
        }
        cout << endl;
    }
    return 0;
}