e.cpp

#include<bits/stdc++.h>
#define MAXN 51

using namespace std;

int grid[MAXN][MAXN];
bitset <MAXN> vis[MAXN];
int n;

void dfs(int x, int y) {
    vis[x][y] = 1;
    if(grid[x][y] != 1) {
        if(x - 1 >= 0 && !vis[x-1][y]) dfs(x-1, y);
        if(x + 1 < n && !vis[x+1][y]) dfs(x+1, y);
        if(y - 1 >= 0 && !vis[x][y-1]) dfs(x, y-1);
        if(y + 1 < n && !vis[x][y+1]) dfs(x, y+1);
    }
}

int main() {
    int initX, initY, endX, endY;
    cin >> n;
    cin >> initX >> initY;
    cin >> endX >> endY;

    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            scanf("%d", grid[i][j]);
        }
    }

    dfs(initX, initY);
    dfs(endX, endY);

    return 0;
}