Compilare: main.cpp: In function 'int main()': main.cpp:53:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < s.size() ; i++) ~~^~~~~~~~~~ main.cpp:58:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i] >= 'a' && s[i] <= 'z' && i <= s.size()) ~~^~~~~~~~~~~ main.cpp:69:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < stv.size() ; i++) ~~^~~~~~~~~~~~ main.cpp:70:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1 ; j < stv.size() ; j++) ~~^~~~~~~~~~~~