Compilare: user.cpp: In function ‘void rsort(std::vector<int>&)’: user.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v.size(); ++i) ^ user.cpp:15:10: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k; ^ user.cpp: In function ‘int main()’: user.cpp:60:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=N;i++) ^