Compilare: main.cpp: In function 'int main()': main.cpp:14:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < s.size() - 1;i++) ~~^~~~~~~~~~~~~~ main.cpp:20:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ok && i < s.size() - 1) ~~^~~~~~~~~~~~~~ main.cpp:52:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2;i < s.size();i++) ~~^~~~~~~~~~ main.cpp:60:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(size == st.size()) ~~~~~^~~~~~~~~~~~