在大小为 2N 的数组 A 中有 N+1 个不同的元素,其中有一个元素重复了 N 次. 返回重复了 N 次的那个元素. 示例 1: 输入:[1,2,3,3] 输出:3 示例 2: 输入:[2,1,2,5,3,2] 输出:2 示例 3: 输入:[5,1,5,2,5,3,5,4] 输出:5 提示: 4 <= A.length <= 10000 0 <= A[i] < 10000 A.length 为偶数 class Solution { public: int repeatedNTim…

题目标签:HashMap 题目给了我们一个size 为 2N 的int array,其中有 N + 1 个唯一的 数字,让我们找出那个重复的数字. 利用hashset,把每一个数字存入,一旦发现有重复的,就返回这个数字. Java Solution: Runtime: 4 ms, faster than 93.76% Memory Usage: 40.7 MB, less than 65.88% 完成日期:03/11/2019 关键点:hashset class Solution { publi…

905. Sort Array By Parity (Easy)# Given an array A of non-negative integers, return an array consisting of all the even elements of A, followed by all the odd elements of A. You may return any answer array that satisfies this condition. Example 1: In…

problem 961. N-Repeated Element in Size 2N Array solution: class Solution { public: int repeatedNTimes(vector<int>& A) { unordered_map<int, int> amap; for(auto a:A) { amap[a]++; } , max_val; for(auto a:amap) { if(a.second>max_num) { max…

In a array A of size 2N, there are N+1 unique elements, and exactly one of these elements is repeated N times. Return the element repeated N times. Example 1: Input: [1,2,3,3] Output: 3 Example 2: Input: [2,1,2,5,3,2] Output: 2 Example 3: Input: [5,1…

In a array A of size 2N, there are N+1 unique elements, and exactly one of these elements is repeated N times. Return the element repeated N times. Example 1: Input: [1,2,3,3] Output: 3 Example 2: Input: [2,1,2,5,3,2] Output: 2 Example 3: Input: [5,1…

题目要求 In a array A of size 2N, there are N+1 unique elements, and exactly one of these elements is repeated N times. Return the element repeated N times. 题目分析及思路 题目给出一个长度为2N的数组,其中有N+1个不同元素,有一个元素重复了N次,要求返回该重复N次的元素.可以随机从数组中获得两个元素,如果这两个元素相同,则该元素就是题目所要返回的…

In a array A of size 2N, there are N+1 unique elements, and exactly one of these elements is repeated N times. Return the element repeated N times. Example 1: Input: [1,2,3,3] Output: 3 Example 2: Input: [2,1,2,5,3,2] Output: 2 Example 3: Input: [5,1…

In a array A of size 2N, there are N+1 unique elements, and exactly one of these elements is repeated N times. Return the element repeated N times. Example 1: Input: [1,2,3,3] Output: 3 Example 2: Input: [2,1,2,5,3,2] Output: 2 Example 3: Input: [5,1…

题目如下: In a array A of size 2N, there are N+1 unique elements, and exactly one of these elements is repeated N times. Return the element repeated N times. Example 1: Input: [1,2,3,3] Output: 3 Example 2: Input: [2,1,2,5,3,2] Output: 2 Example 3: Input…