九度-1371-最小的K个数 | Acm之家



九度-1371-最小的K个数 | Acm之家

输入n个整数,找出其中最小的K个数。例如输入4,5,1,6,2,7,3,8这8个数字,则最小的4个数字是1,2,3,4,。
输入:
每个测试案例包括2行:第一行为2个整数n,k(1<=n,k<=200000),表示数组的长度。

第二行包含n个整数,表示这n个数,数组中的数的范围是[0,1000 000 000]。

输出:
对应每个测试案例,输出最小的k个数,并按从小到大顺序打印。
样例输入:
8 4 4 5 1 6 2 7 3 8
样例输出:
1 2 3 4

此题的不同之处是最后的输出结果需要是排序过的,一般是不要求这个的。

最常见的解法就是使用快速排序和大顶堆。

方法一使用快速排序的思想,划分的操作不用改,对递归部分稍作修改


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