Compilare: user.cpp: In member function ‘int& IHASH::operator[](int)’: user.cpp:63:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<h[arg].size(); ++i) ^ user.cpp:62:13: warning: unused variable ‘poz’ [-Wunused-variable] int poz = arg % MOD; ^ user.cpp: In function ‘int main()’: user.cpp:102:18: warning: unused variable ‘c’ [-Wunused-variable] int n, l, u, c, dr; ^ user.cpp:102:21: warning: unused variable ‘dr’ [-Wunused-variable] int n, l, u, c, dr; ^ user.cpp:103:9: warning: variable ‘ans’ set but not used [-Wunused-but-set-variable] i64 ans; ^