#include "base2.h" long puissance_de_2(unsigned n) { long p2 = 1; for (int i = 0; i < n; i++) { p2 *= 2; } return p2; } int ilog2(unsigned long n) { int l2 = 0; long p2 = 1; // 2^l2; while (p2 < n) { p2 *= 2; l2 ++; } return l2; }