Compilare: main.cpp: In function 'int main()': main.cpp:24:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<=v.size();i++){ ~^~~~~~~~~~ main.cpp:27:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v.size();j++){ ~^~~~~~~~~ main.cpp:32:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == v.size()) ~~^~~~~~~~~~~