Compilare: user.cpp: In function ‘int main()’: user.cpp:13:9: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] f>>x+1; ^ user.cpp:14:9: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] f>>y+1; ^ user.cpp:38:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nr.size();i++) ^