mirror of
https://github.com/krahets/hello-algo.git
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e720aa2d24
* Sync recent changes to the revised Word. * Revised the preface chapter * Revised the introduction chapter * Revised the computation complexity chapter * Revised the chapter data structure * Revised the chapter array and linked list * Revised the chapter stack and queue * Revised the chapter hashing * Revised the chapter tree * Revised the chapter heap * Revised the chapter graph * Revised the chapter searching * Reivised the sorting chapter * Revised the divide and conquer chapter * Revised the chapter backtacking * Revised the DP chapter * Revised the greedy chapter * Revised the appendix chapter * Revised the preface chapter doubly * Revised the figures
79 lines
1.7 KiB
Go
79 lines
1.7 KiB
Go
// File: array.go
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// Created Time: 2022-12-29
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// Author: GuoWei (gongguowei01@gmail.com), cathay (cathaycchen@gmail.com)
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package chapter_array_and_linkedlist
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import (
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"math/rand"
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)
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/* 随机访问元素 */
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func randomAccess(nums []int) (randomNum int) {
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// 在区间 [0, nums.length) 中随机抽取一个数字
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randomIndex := rand.Intn(len(nums))
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// 获取并返回随机元素
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randomNum = nums[randomIndex]
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return
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}
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/* 扩展数组长度 */
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func extend(nums []int, enlarge int) []int {
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// 初始化一个扩展长度后的数组
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res := make([]int, len(nums)+enlarge)
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// 将原数组中的所有元素复制到新数组
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for i, num := range nums {
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res[i] = num
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}
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// 返回扩展后的新数组
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return res
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}
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/* 在数组的索引 index 处插入元素 num */
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func insert(nums []int, num int, index int) {
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// 把索引 index 以及之后的所有元素向后移动一位
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for i := len(nums) - 1; i > index; i-- {
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nums[i] = nums[i-1]
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}
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// 将 num 赋给 index 处的元素
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nums[index] = num
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}
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/* 删除索引 index 处的元素 */
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func remove(nums []int, index int) {
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// 把索引 index 之后的所有元素向前移动一位
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for i := index; i < len(nums)-1; i++ {
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nums[i] = nums[i+1]
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}
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}
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/* 遍历数组 */
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func traverse(nums []int) {
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count := 0
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// 通过索引遍历数组
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for i := 0; i < len(nums); i++ {
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count += nums[i]
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}
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count = 0
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// 直接遍历数组元素
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for _, num := range nums {
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count += num
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}
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// 同时遍历数据索引和元素
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for i, num := range nums {
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count += nums[i]
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count += num
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}
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}
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/* 在数组中查找指定元素 */
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func find(nums []int, target int) (index int) {
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index = -1
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for i := 0; i < len(nums); i++ {
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if nums[i] == target {
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index = i
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break
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}
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}
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return
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}
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