Compilare: main.cpp: In function 'int main()': main.cpp:47:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+(i&1); j<v.size(); j+=2) ~^~~~~~~~~ main.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1-(i&1); j<v.size(); j+=2) ~^~~~~~~~~