一、题目
Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j] and the absolute difference between i and j is at most k.
二、
class Solution(object):
def containsNearbyDuplicate(self, nums, k):
"""
:type nums: List[int]
:type k: int
:rtype: bool
"""
d = {}
for i in range(len(nums)):
if nums[i] in d:
j = d[nums[i]]
if i-j <= k:
return True
d[nums[i]] = i #前i个数去重
return False
