Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements that appear twice in this array. Could you do it without extra space and in O(n) runtime? Example: Input: [4,3,2,7,…

public class Solution { Dictionary<int, int> dic = new Dictionary<int, int>(); public IList<int> FindDuplicates(int[] nums) { var list = new List<int>(); foreach (var n in nums) { if (!dic.ContainsKey(n)) { dic.Add(n, ); } else { l…

今天莫名其妙睡到了中午,很难受... leetcode442 https://leetcode.com/problems/find-all-duplicates-in-an-array/?tab=Descriptionleetcode531 https://leetcode.com/problems/lonely-pixel-i/?tab=Descriptionleetcode533 https://leetcode.com/problems/lonely-pixel-ii/?tab=Descr…

1.Algorithm:每周至少做一个 leetcode 的算法题2.Review:阅读并点评至少一篇英文技术文章3.Tip:学习至少一个技术技巧4.Share:分享一篇有观点和思考的技术文章 考研真难 , 卷的厉害 , 还能怎么着 . 接着熬 , 继续更新 以下是各项的情况: Algorithm 链接:[LeetCode-442]-Find All Duplicates in an Array 题意: 给定一个链表: 1->2->3->4->5, 和 n = 2. 当删除了倒数第…