Compilare: main.cpp: In function 'bool ok(int64_t)': main.cpp:13:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(da.size()>=n-k && abs(da[0]-da[1])>nr) ~~~~~~~~~^~~~~ main.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(da.size()>=n-k && abs(da.back()-da[da.size()-2])>nr) ~~~~~~~~~^~~~~ main.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<da.size();i++) ~^~~~~~~~~~ main.cpp:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return (da.size()>=(n-k)); ~~~~~~~~~^~~~~~~