问题描述
Given an array of integers, find if the array contains any duplicates.
Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct.
思路
先排序,然后两两对比,有相同的返回True,否则False
def containsDuplicate(self, nums):
"""
:type nums: List[int]
:rtype: bool
"""
if len(nums) ==0: return False
nums.sort()
tmp = nums[0]
for i in range (1, len(nums)):
if nums[i] == tmp:
return True
tmp = nums[i]
return False
别人的骚操作
def containsDuplicate(self, nums):
"""
:type nums: List[int]
:rtype: bool
"""
num_set = set(nums)
if len(nums) == len(num_set):
return False
return True