Compilare: user.cpp: In function ‘int cmp(std::string, std::string)’: user.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size();i++) ^ user.cpp: In function ‘bool inclus(std::string, std::string)’: user.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<b.size();j++) ^ user.cpp:35:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cont==a.size()) ^ user.cpp: In function ‘int main()’: user.cpp:50:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {if(a[i].size()>maxx) ^ user.cpp:55:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[i].size()==maxx) ^ user.cpp:41:13: warning: unused variable ‘ok’ [-Wunused-variable] {int i,maxx,ok=1,nr=0,cont=0; ^