Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:12:5: error: ‘fin’ was not declared in this scope fin >> a >> b; ^ user.cpp:13:25: error: ‘B’ was not declared in this scope Ans = 1LL * (1LL * (B+1)*(B+2)/2) * (1LL * (B+1)*(B+2)/2)) ^ user.cpp:13:62: error: expected ‘;’ before ‘)’ token Ans = 1LL * (1LL * (B+1)*(B+2)/2) * (1LL * (B+1)*(B+2)/2)) ^ user.cpp:16:5: error: ‘fout’ was not declared in this scope fout << Ans << '\n'; ^