Compilare: main.cpp: In function 'int main()': main.cpp:10:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;++i) f>>v[i]; ~^~~ main.cpp:13:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=n;++j) ~^~~ main.cpp:19:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<=r) sol++; ~^~~