版权声明:版权归个人所有,未经博主允许,禁止转载 https://blog.csdn.net/danspace1/article/details/88991951
原题
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.
Example 1:
Input: nums = [1,2,3,1], k = 3
Output: true
Example 2:
Input: nums = [1,0,1,1], k = 1
Output: true
Example 3:
Input: nums = [1,2,3,1,2,3], k = 2
Output: false
解法
字典存储数值和对应的index, 如果遇到数值已存在且之前的index与现在的index的距离 <= k, 返回True
代码
class Solution(object):
def containsNearbyDuplicate(self, nums, k):
"""
:type nums: List[int]
:type k: int
:rtype: bool
"""
d = collections.defaultdict(list)
for i, n in enumerate(nums):
if n in d and i - d[n][-1] <= k:
return True
else:
d[n].append(i)
return False