View Compilation Error

0_0_39500981_2695.cpp: In function 'void solve()':
0_0_39500981_2695.cpp:21:41: error: 'ans' was not declared in this scope; did you mean 'abs'?
   21 |                                         ans+=f[i][j][k],ans%mod;
      |                                         ^~~
      |                                         abs
0_0_39500981_2695.cpp:31:15: error: 'ans' was not declared in this scope; did you mean 'abs'?
   31 |         cout<<ans<<endl;
      |               ^~~
      |               abs