Compilare: user.cpp: In function ‘int find(int)’: user.cpp:16:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<H[hash].size();j++) ^ user.cpp: In function ‘void insert(int)’: user.cpp:30:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(find(x)==H[hash].size()) ^ user.cpp: In function ‘int main()’: user.cpp:44:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(find(x)!=H[hash].size()) fout<<1<<"\n"; ^