【Everyday】(12)寻找缺失的数 - Everyday - SegmentFault



【Everyday】(12)寻找缺失的数 - Everyday - SegmentFault

给出一个包含 0 .. N 中 N 个数的序列，找出0 .. N 中没有出现在序列中的那个数。

样例
N = 4 且序列为 [0, 1, 3] 时，缺失的数为2。

注意
可以改变序列中数的位置。

挑战
在数组上原地完成，使用O(1)的额外空间和O(N)的时间


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