You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
36 lines
888 B
36 lines
888 B
/*
|
|
* @Author: gyt95 (gytkwan@gmail.com)
|
|
* @Date: 2022-12-15 10:51:54
|
|
* @Last Modified by: gyt95 (gytkwan@gmail.com)
|
|
* @Last Modified time: 2022-12-15 23:40:09
|
|
*/
|
|
|
|
/**
|
|
* @param {number[]} nums
|
|
* @param {number} target
|
|
* @return {number[]}
|
|
*/
|
|
function twoSumBruteForce(nums, target) {
|
|
let n = nums.length;
|
|
// 两层循环，时间复杂度 O(n^2)
|
|
for (let i = 0; i < n; i++) {
|
|
for (let j = i + 1; j < n; j++) {
|
|
if (nums[i] + nums[j] === target) {
|
|
return [i, j];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function twoSumHashTable(nums, target) {
|
|
// 辅助哈希表，空间复杂度 O(n)
|
|
let m = {};
|
|
// 单层循环，时间复杂度 O(n)
|
|
for (let i = 0; i < nums.length; i++) {
|
|
if (m[nums[i]] !== undefined) {
|
|
return [m[nums[i]], i];
|
|
} else {
|
|
m[target - nums[i]] = i;
|
|
}
|
|
}
|
|
} |