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Warning: session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in /var/www/tb-usercake/models/config.php on line 51
static L selectRandom_fast(L 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); }