Compilare: main.cpp: In function 'int main()': main.cpp:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<s.size(); j++) ~^~~~~~~~~ main.cpp:59:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v.size()-1 && ok; i++) ~^~~~~~~~~~~ main.cpp:74:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v.size(); i++) ~^~~~~~~~~