answer.code:7:7: error: expected nested-name-specifier before ‘ll’
    7 | using ll=long long;
      |       ^~
answer.code: In function ‘int main()’:
answer.code:24:5: error: ‘ll’ was not declared in this scope
   24 |     ll ans = 0;
      |     ^~
answer.code:29:9: error: ‘ans’ was not declared in this scope; did you mean ‘abs’?
   29 |         ans += mp[pii(A - B, B - C)] + mp1[pii(A - B, C)] + mp2[pii(A - C, B)] + mp3[pii(B - C, A)];
      |         ^~~
      |         abs
answer.code:39:13: error: ‘ans’ was not declared in this scope; did you mean ‘abs’?
   39 |     cout << ans << '\n';
      |             ^~~
      |             abs