以下N行每行一個整數Ai。
對于40%的數據,1 <= K <= N <= 100
對于60%的數據,1 <= K <= 1000
對于100%的數據,1 <= K <= N <= 100000 -100000 <= Ai <= 100000
5 3 -100000 -10000 2 100000 10000
999100009
3123123132123123123123124123sr werv1323121231231111111111111111111111111111111111111111111