Compilare: main.cpp: In function 'int main()': main.cpp:52:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ~^~~~~~~~~ main.cpp:55:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size() && s[i]!=' ') ~^~~~~~~~~ main.cpp:65:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nod[pos].size();i++) ~^~~~~~~~~~~~~~~~