Compilare: main.cpp: In function 'int main()': main.cpp:18:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r[0]<i) ~~~~^~ main.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=r[0];i++) ~^~~~~~ main.cpp:30:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] { if(v[i]<=i) ~~~~^~~