Compilare: user.cpp: In function ‘long long int sol(unsigned int)’: user.cpp:51:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++i) ^ user.cpp:57:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (nr > length) ^ user.cpp: In function ‘int main()’: user.cpp:76:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++i) ^ user.cpp:82:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++i) ^ user.cpp: In function ‘int Find(unsigned int)’: user.cpp:42:1: warning: control reaches end of non-void function [-Wreturn-type] } ^