number of elements (5000)
2667, 4328, 2888, 3214, 866, 3341, 2659, 1529, 132, 3577, ...

heap initial : check (OK), time (1ms)
4939, 4844, 4753, 4813, 4704, 4711, 4724, 4438, 4753, 4591, ...

heap sorted : check (OK), time (1ms)
4939, 4844, 4813, 4753, 4753, 4724, 4711, 4707, 4704, 4701, ...