Compilare: main.cpp: In function 'int main()': main.cpp:14:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++){ ~^~~~~~~~~ main.cpp:16:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i+j<s.size() && s[i+j]>='a' && s[i+j]<='z'){ ~~~^~~~~~~~~