LeetCode 1. Two Sum

题目

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

You may assume that each input would have exactly one solution, and you may not use the same element twice.

You can return the answer in any order.

题意

阵列中两个元素相加若等於target，回传元素的索引值。

Example 1:

Input: nums = [2,7,11,15], target = 9
Output: [0,1]

Example 2:

Input: nums = [3,2,4], target = 6
Output: [1,2]

Example 3:

Input: nums = [3,3], target = 6
Output: [0,1]

解题想法

使用双回圈，遍历元素，若相加等於target，回传索引值。

Solution

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