View Compilation Error

0_0_39270689_8220.cpp: In function 'const int pre()':
0_0_39270689_8220.cpp:4:9: error: 'f' was not declared in this scope
    4 |         f[0][0]=1;
      |         ^
0_0_39270689_8220.cpp:14:25: error: 'g' was not declared in this scope
   14 |                         g[l][v]+=f[l][v];
      |                         ^
0_0_39270689_8220.cpp: In function 'int solve(int, int)':
0_0_39270689_8220.cpp:22:16: error: 'calc' was not declared in this scope; did you mean 'calloc'?
   22 |         int fa=calc(A);
      |                ^~~~
      |                calloc
0_0_39270689_8220.cpp:24:1: error: expected initializer before '}' token
   24 | }
      | ^
0_0_39270689_8220.cpp: In function 'int main()':
0_0_39270689_8220.cpp:27:21: error: 'T' was not declared in this scope
   27 |         scanf("%d",&T);
      |                     ^