在JavaScript中,散列(Hash)是一种常见的数据结构,用于将数据按照特定的规则进行分组。在Group by操作中,我们可以使用散列来将一个数组按照指定的键进行分组,并将相同键值的元素放在一起。 实现Group by和sum数组的方法如下: 代码语言:txt 复制 // 原始数组 const arr = [ { name: 'apple', category: 'fruit'...
return [oldArr.indexOf(arr[i]), oldArr.length - 1 - oldArr.reverse().indexOf(arr[j])] } } } } const oldArray = nums.slice(0) nums.sort((a, b) => a - b) let tailIndex = nums.findIndex((value, index) => { return value >= target - nums[0] && index !== 0 }) if ...
解题思路:构造了arr{ key:value} 对象。将target-nums[i] 差值放在arr{ }对象中,并存储其位置i。然后每次就在arr{ }对象中找有没有对应的数即可。 function twoSum(nums, target) { var arr = {}; for (var i = 0; i < nums.length; i++) { if (typeof(arr[nums[i]]) !== "undefined"...
所以返回 [0, 1] Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would haveexactlyone solution, and you may not use thesameelement twice. Example: Given nums = [2, 7, 11, 15], target = 9, ...
In this example, we again define a function called sumArray. Here, we use the reduce method on the array arr. The reduce method takes a callback function that receives two arguments: an accumulator and the currentValue. The accumulator keeps track of the running total, while currentValue rep...
Two Sum: Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use the same element twice. 两数之和 : ...
不过发现他们两个都不能提交js的代码 然后就找到了leetcode.com 刷起了最简单的第一题 1. Two Sum Description Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may...
如果在 Object 中,以 B 为 key 值的value 存在,则此时 A 的索引和以 B 为 key 的value 值, 即为所求结果。 得出如下答案。 Answer: var twoSum = function(nums, target) { var res = {} for (var i = 0; i < nums.length; i++) { var other = target - nums[i] if (res[other] !
Latest version: 2.0.0, last published: 5 years ago. Start using sum-two-number in your project by running `npm i sum-two-number`. There are no other projects in the npm registry using sum-two-number.
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