Compilare: main.cpp: In function 'int main()': main.cpp:67:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < v.size() ; i++){ ~~^~~~~~~~~~ main.cpp:77:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1 ; j < v.size(); j++){ ~~^~~~~~~~~~ main.cpp:78:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == 0 && j == v.size() - 1) ~~^~~~~~~~~~~~~~~