''' 样例 样例 1: 输入:[1,1,2,2,3,4,4] 输出:3 解释: 仅3出现一次 样例 2: 输入:[0,0,1] 输出:1 解释: 仅1出现一次 ''' def singleNumber(A): d = {} for i in A: if d.get(i, -1) == -1: d[i] = 1 else: d[i] += 1 for i, j in d.items(): if j == 1: return i if __name__ == '__main__': print(singleNumber([1,1,2,2,3,4,4])) print(singleNumber([0,0,1]))
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