LeetCode Top Interview 150

219. Contains Duplicate II

Easy

Given an integer array nums and an integer k, return true if there are two distinct indices i and j in the array such that nums[i] == nums[j] and abs(i - j) <= 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

Constraints:

• 1 <= nums.length <= 105
• -109 <= nums[i] <= 109
• 0 <= k <= 105

Solution

from typing import List, Dict

class Solution:
    def containsNearbyDuplicate(self, nums: List[int], k: int) -> bool:
        map_dict = {}
        length = len(nums)
        for i in range(length):
            index = map_dict.get(nums[i])
            if index is not None and abs(index - i) <= k:
                return True
            map_dict[nums[i]] = i
        return False

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