CE求调

代码一堆离奇的报错

#include<bits/stdc++.h>
using namespace std;
int n, x1, y1, x2, y2;
char g[1005][1005];
int dx[] = { -1,0,1,0 };
int dy[] = { 0,1,0,-1 };
struct node {
    int x, y, step;
};
void bfs() {
    queue<node>q;
    q.push(node{ x1,y1,0 });
    g[x1][y1] = '1';
    while (!q.empty()) {
        node now = q.front();
        q.pop();
        if (now.x == x2 && now.y == y2) {
            cout << now.step;
            return;
        }
        for (int i = 0; i < 4; i++) {
            node next = node{ now.x + dx[i],now.y + dy[i],now.step + 1 };
            if (next.x >= 1 && next.x <= n && next.y >= 1 && next.y <= n && g[next.x][next.y] == '0') {
                q.push(next);
                g[next.x][next.y] = '1';
            }
        }
    }
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> n;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= n; j++) cin >> g[i][j];
    }
    cin >> x1 >> y1 >> x2 >> y2;
    bfs();
    return 0;
}