Update KthNum.js #507
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Update KthNum.js #507
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L11：因为要求是求第K大的数，由于分区是从小到大排序，第K大的数就是第 len - (k - 1) 小的数； L14：如果基准点到了第一个或者最后一个，也就是说已经把三份的数组分成了两份，说明已经从小到大排序完成了，这时直接根据要求，给出第k个即可
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L11：因为要求是求第K大的数，由于分区是从小到大排序，第K大的数就是第 len - (k - 1) 小的数；
L14：如果基准点到了第一个或者最后一个，也就是说已经把三份的数组分成了两份，说明已经从小到大排序完成了，这时直接根据要求，给出第k个即可