< > BotCompany Repo | #1011028 // selectRandom_fast

JavaX fragment (include)

static <A> L<A> selectRandom_fast(L<A> l, int k) {
  int n = l(l);
  l = cloneList(l);
  for (int i = n - 1; i >= n-k; i--) {
    int j = random(i+1);
    swapElements(l, i, j);
  }
  ret subList(l, n-k);
}

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