以下N行每行一个整数Ai。
对于40%的数据,1 <= K <= N <= 100
对于60%的数据,1 <= K <= 1000
对于100%的数据,1 <= K <= N <= 100000 -100000 <= Ai <= 100000
5 3 -100000 -10000 2 100000 10000
999100009
2018年真题精选
2194,2276,2277,2279,2280,2281,2282,2283,2284,2285,2286,2287,
2288,2291,2292,2294,2296
2194,2276,2277,2279,2280,2281,2282,2283,2284,2285,2286,2287,
2288,2291,2292,2294,2296