Compilare: user.cpp: In function ‘bool subsir(std::string, std::string)’: user.cpp:12:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(poza=0, pozb=0; poza<a.size() && pozb<b.size(); poza++) ^ user.cpp:12:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(poza=0, pozb=0; poza<a.size() && pozb<b.size(); poza++) ^ user.cpp:14:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return b.size()==pozb; ^ user.cpp: In function ‘int main()’: user.cpp:26:14: warning: statement has no effect [-Wunused-value] for(n; n>0; n--) ^ user.cpp:35:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(x.size()>maxL) ^ user.cpp:40:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(x.size()==maxL && x.compare(maxchar)==-1) ^