Compilare: user.cpp: In function ‘int solve()’: user.cpp:101:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v1.size();i++) ^ user.cpp:42:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘bool cmp(const hashing&, const hashing&)’: user.cpp:29:1: warning: control reaches end of non-void function [-Wreturn-type] } ^