!7

static int n = 100000;

p {
  for (int listSize = 90; listSize <= 100; listSize++) {
    O[] array = new O[n];
    long mem1 = usedMemoryAfterGC();
    for i over array: array[i] = rep(null, listSize);
    long mem2 = usedMemoryAfterGC();
    double objSize = (mem2-mem1)/(double) l(array);
    int rounded = iround(objSize);
    long f = guessArrayListSize(listSize);
    bool ok = rounded == f;
    print((ok ? "OK " : "") + "ArrayList size=" + listSize + ". Approximate object size: " + objSize + " => " + rounded + " bytes. Formula: " + f);
  }
}

Began life as a copy of #1009433