Compilare: main.cpp: In function 'int main()': main.cpp:36:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ~^~~~~~~~~ main.cpp:48:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;!v.empty() && i<v.size()-1;i++) ~^~~~~~~~~~~ main.cpp:55:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ~^~~~~~~~~ main.cpp:58:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ~^~~~~~~~~