foo.c: In function 'main':
foo.c:13:25: error: 'g' undeclared (first use in this function)
   13 |                         g[i][j]=1;
      |                         ^
foo.c:13:25: note: each undeclared identifier is reported only once for each function it appears in

[Hydro](https://hydro.ac)提供评测服务