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LearningNotes

Take notes of whatever I learn everyday in work and study.

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Find missing numbers in a list

在一个1到N的整数列表中，找出缺失的数
代码如下：

def missing_numbers(num_list):
      original_list = [x for x in range(num_list[0], num_list[-1] + 1)]
      num_list = set(num_list)
      return (list(num_list ^ set(original_list)))

注意：

  1. num_list 需要事先排序
  2. python 中的集合异或运算：将两个集合中，各自独有的元素组合为一个新的集合
    例如： 
    s1 = set([1,2,3])
s2 = set([2,3,4])
s = s1 ^ s2
    s 为 {1， 4}

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