Warning: session_start(): open(/var/lib/php/sessions/sess_5bs2pcnoab21t9j09gfs3assv0, O_RDWR) failed: No space left on device (28) in /var/www/tb-usercake/models/config.php on line 51

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 LL allPermutations(L l) { new LL out; allPermutations_impl(cloneList(l), l(l), out); ret out; } static void allPermutations_impl(L l, int n, LL out) { if (n <= 1) { ping(); out.add(cloneList(l)); } else for(int i = 0; i < n; i++) { allPermutations_impl(l, n-1, out); swapElements(l, n % 2 == 0 ? i : 0, n-1); } }