Compilare: user.cpp: In function ‘void counting_sort(std::vector<int>&, int)’: user.cpp:81:19: warning: the address of ‘int key(int, int)’ will always evaluate as ‘true’ [-Waddress] if(key) ^ user.cpp: In function ‘void quicksort(std::vector<int>&, int, int)’: user.cpp:149:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<aux.size()+siz;++i){ ^ user.cpp:150:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<aux.size())v[s+i]=aux[i]; ^