Compilare: user.cpp: In function ‘void Add(int)’: user.cpp:12:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[l].size();i++) ^ user.cpp: In function ‘void Del(int)’: user.cpp:20:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[l].size();i++) ^ user.cpp: In function ‘int Search(int)’: user.cpp:30:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[l].size();i++) ^ user.cpp:29:17: warning: unused variable ‘ok’ [-Wunused-variable] { int i,l=x%mod,ok=1; ^