LeetCode — Contains Duplicate II

题目描述: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 difference between i and j is at most k.在一个数组nums中试着找到两个数nums[i]和nums[j],其中,i与j的距离要小于等于k。如果找到,返回true,否则返回false。思路:一次遍历num[i…n),哈希存每个数的位置,如果nums[i]已经出现,就判断上次出现的位置与当前位置的距离是否小于等于k。如果是,返回true;否则,更新Hash[nums[i]]的位置=i。实现代码:public class Solution {public bool ContainsNearbyDuplicate(int[] nums, int k){var hash = new Dictionary<int, int>();for(var i = 0;i < nums.Length; i++){if(!hash.ContainsKey(nums[i])){hash.Add(nums[i],i);}else{if(Math.Abs(hash[nums[i]] – i) <= k){return true;}else{hash[nums[i]] = i;}}}return false;}}

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LeetCode — Contains Duplicate II

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