Compilare: user.cpp: In function ‘int find(int)’: user.cpp:12:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[list].size();++i) ^ user.cpp: In function ‘void del(int)’: user.cpp:21:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[list].size();++i) ^ user.cpp:24:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=i+1;i<v[list].size();++i) ^ user.cpp: In function ‘void insert(int)’: user.cpp:31:9: warning: unused variable ‘i’ [-Wunused-variable] int i,list=x%MOD; ^