Compilare: user.cpp: In function ‘void radix(unsigned int, unsigned int*, unsigned int*, unsigned int)’: user.cpp:21:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n; i++) x[v[i] >> bit & 0xff]++; ^ user.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n; i++) w[x[v[i] >> bit & 0xff]++] = v[i]; ^ user.cpp: In function ‘int main()’: user.cpp:29:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] v[0] = b; for (int i = 1; i < n; i++) v[i] = (1ULL * a * v[i - 1] + b) % c; ^