求调

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int n,m,sx,sy,ans[410][410];
bool vis[410][410];
int nx[8] = {-2,-1,1,2,2,1,-1,-2},ny[8] = {1,2,2,1,-1,-2,-2,-1};
struct Node{
    int x,y,dep;
};
queue<Node> q;
int read(){
    int x = 0,w = 1;
    char ch = getchar();
    while(ch < '0' || ch > '9'){
        if(ch == '-')   w = -w;
        ch = getchar();
    }
    while(ch >= '0'&& ch <= '9'){
        x = x * 10 + ch - '0';
        ch = getchar();
    }
    return w * x;
}
void print(int x){
    if(x < 0) putchar('-'),x = -x;
    if(x > 9) print(x / 10);
    putchar(x % 10 + '0');
}
int main(){
    cin >> n >> m >> sx >> sy;
    for(int i = 1;i <= n;i++){
        for(int j = 1;j <= m;j++){
            ans[i][j] = -1;
            vis[i][j] = false;
        }
    }
    q.push({sx,sy,0});
    while(!q.empty()){
        int kx = q.front().x,ky = q.front().y,d = q.front().dep;
        q.pop();
        ans[kx][ky] = d,vis[kx][ky] = true;
        for(int i = 0;i < 8;i++){
            int x = kx = nx[i],y = ky + ny[i];
            //cout << x << " " << y << " " << vis[x][y] << endl;
            if(x >= 1 && y >= 1 && x <= n && y <= m) if(!vis[x][y]) q.push({x,y,d + 1});
        }
    }
    for(int i = 1;i <= n;i++){
        for(int j = 1;j <= m;j++){
            cout << ans[i][j] << " ";
        }
        cout << endl;
    }
    return 0;
} 

坐标移动自查过没有问题，但不知道为什么从第三次跳跃就变成“1 3”而不是设置的“2 3”了。