Compilare: user.cpp: In function ‘int main()’: user.cpp:54:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1 ; i <= n && found < m ; ++ i) { ^ user.cpp:57:23: warning: unused variable ‘first’ [-Wunused-variable] unsigned long long first = 1ULL * (act % k) * ((act / k) + 1) * ((act / k) + 1); ^ user.cpp:58:23: warning: unused variable ‘second’ [-Wunused-variable] unsigned long long second = 1ULL * (k - (act % k)) * (act / k) * (act / k); ^ user.cpp:70:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == n - m) ^