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feat:添加easy第一天的js题解以及文档修改
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README.md

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## [Easy](https://leetcode.com/problemset/all/?difficulty=Easy)题解
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| 题目 | 题解 | kotlin | JavaScript | Java |
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| :-----------------: | -------------------------------------- | :--------------: | :-------: | :------------: |
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| [1][1-question] | [Two Sum][1-tips] | [][1-kotlin] | | [][1-java] |
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| [1][1-question] | [Two Sum][1-tips] | [][1-kotlin] |[][1-JavaScript] | [][1-java]|
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| [728][728-question] | [Self Dividing Numbers][728-tips] | | | [][728-java] |
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| [771][771-question] | [Jewels and Stones][771-tips] | [][771-kotlin] | | [][771-java] |
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| [804][804-question] | [Unique Morse Code Words][804-tips] | | | [][804-java] |
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## 贡献者名单
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- 感谢[@Mukyu](https://github.com/Mukyu), 提供Java题解、文档整理。
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- 感谢[@taryn](https://github.com/taryn2016), 提供JavaScript题解、文档整理。
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- 感谢[@WangXin](https://github.com/relish-wang), 提供kotlin题解、文档整理。
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[2-kotlin]: ./src/_2/kotlin/Solution.kt
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[771-kotlin]: ./src/_771/kotlin/Solution.kt
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[1-JavaScript]: ./src/_1/Solution.js
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[1-java]: ./src/_1/Solution.java
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[2-java]: ./src/_2/Solution.java
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[728-java]: ./src/_728/Solution.java

src/_1/Solution.js

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/**
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* @param {number[]} nums
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* @param {number} target
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* @return {number[]}
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*/
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var twoSum = function(nums, target) {
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for (let i = 0; i < nums.length - 1; i++) {
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res = target - nums[i]
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for (let j = i + 1; j < nums.length; j++) {
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if (nums[j] === res) {
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return [i, j]
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}
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}
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if (i === nums.length) {
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return []
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}
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}
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}

tips/1/README.md

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}
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}
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```
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### JavaScript
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```JavaScript
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var twoSum = function(nums, target) {
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for (let i = 0; i < nums.length - 1; i++) {
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res = target - nums[i]
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for (let j = i + 1; j < nums.length; j++) {
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if (nums[j] === res) {
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return [i, j]
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}
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}
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if (i === nums.length) {
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return []
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}
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}
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}
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```

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