1.mp[sx][sy] = 1;
2.判断越界（函数内）
by QWQ_SczyYA @ 2024-01-28 22:06:23
```cpp
#include <bits/stdc++.h>
using namespace std;
void f(int x,int y);
long long x,y,n,m,t,sx,sy,fx,fy,cnt,xg[10] = {0,0,0,1,-1},yg[10] = {0,1,-1,0,0};
bool ma[10][10];
int main()
{
cin >> n >> m >> t >> sx >> sy >> fx >> fy;
ma[sx][sy] = 1;
for(int i = 1;i <= t;i++)
{
cin >> x >> y;
ma[x][y] = 1;
}
f(sx,sy);
cout << cnt;
return 0;
}
void f(int x,int y)
{
if(x == fx && y == fy)
{
cnt++;
return;
}
for(int i = 1;i <= 4;i++)
{
if(!ma[x + xg[i]][y + yg[i]] && x + xg[i] >= 1 && x + xg[i] <= n && y + yg[i] >= 1 && y + yg[i] <= m)
{
ma[x][y] = 1;
f(x + xg[i],y + yg[i]);
ma[x][y] = 0;
}
}
}
```
码风很烂，将就看看吧
by QWQ_SczyYA @ 2024-01-28 22:12:44
??? 为什么这题我做不了？？？
by jinhaoyu142857 @ 2024-02-01 16:51:00
倒数第4行
by TLE_MLE_RE @ 2024-02-01 18:17:54