Compilare: main.cpp: In function 'int main()': main.cpp:34:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < elems.size(); i++) ~~^~~~~~~~~~~~~~ main.cpp:71:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[i] == elems.size()-1) ~~~~~^~~~~~~~~~~~~~~~~ main.cpp:33:9: warning: unused variable 'index' [-Wunused-variable] int index = 0; ^~~~~