要求 给定两个数组nums,求两个数组交集 输出结果与元素在两个数组中出现的次数一致 不考虑输出结果的顺序 举例 nums1=[1,2,2,1] nums2=[2,2] 结果:[2,2] 思路 使用map,记录nums1中元素及其出现次数 遍历nums2,将重复元素放入结果,同时将该元素出现次数减1 实现 1 class Solution{ 2 public: 3 vector<int> intersect(vector<int>& nums1, vector<int…

查找问题 查找有无(只有键) 元素'a'是否存在 set(集合) 查找对应关系(键值对应) 元素'a'出现了几次 map(字典) set和map的底层实现是红黑树 常见操作 insert() find() erase() change(map):改变某个键对应的值 要求 给定两个数组nums,求两个数组的公共元素 输出结果中每个元素唯一 不考虑输出结果的顺序 举例 nums1=[1,2,2,1] nums2=[2,2] 结果:[2] 实现 将公共元素放入公共的set中 1 class Solut…

169. Majority Element /** * @param {number[]} nums * @return {number} */ var majorityElement = function(nums) { var hash = {}; var y=-1,z; //注意这里的方括号,利用变量访问对象属性时要用方括号 for(var i=0;i<=nums.length-1;i++){ if(hash[nums[i]]){ hash[nums[i]]++; }else{ hash[…

这两道题都是求两个数组之间的重复元素,因此把它们放在一起. 原题地址: 349 Intersection of Two Arrays :https://leetcode.com/problems/intersection-of-two-arrays/description/ 350 Intersection of Two Arrays II:https://leetcode.com/problems/intersection-of-two-arrays-ii/description/ 题目&&am…

350. Intersection of Two Arrays II Given two arrays, write a function to compute their intersection. Example: Given nums1 = [1, 2, 2, 1], nums2 = [2, 2], return [2, 2]. Note: Each element in the result should appear as many times as it shows in both…

problem 350. Intersection of Two Arrays II 不是特别明白这道题的意思,例子不够说明问题: 是按顺序把相同的元素保存下来,还是排序,但是第二个例子没有重复.... 参考 1. Leetcode_350. Intersection of Two Arrays II; 2. CSDN_blogs; 完…

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)题目 Given two arrays, write a function to compute their intersection. Example: Given nums1 = [1, 2, 2, 1], nums2 = [2, 2], return [2, 2]. Note: Each element in t…

Given two arrays, write a function to compute their intersection. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2,2] Output: [2,2] Example 2: Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4] Output: [4,9] Note: Each element in the result should appear as…

Given two arrays, write a function to compute their intersection. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2,2] Output: [2,2] Example 2: Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4] Output: [4,9] Note: Each element in the result should appear as…

""" Intersection of Two Arrays Given two arrays, write a function to compute their intersection. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2,2] Output: [2] Example 2: Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4] Output: [9,4] ""…