Compilare: main.cpp: In function 'int main()': main.cpp:21:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v.size();i++) for (j=i+1;j<v.size();j++) ~^~~~~~~~~ main.cpp:21:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v.size();i++) for (j=i+1;j<v.size();j++) ~^~~~~~~~~