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https://github.com/krahets/hello-algo.git
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42f48405ef
* feat(kotlin): add kotlin code for utils file. * Update ListNode.kt * Update PrintUtil.kt * fix: add the header comment for linkedlist_stack class. * fix(kotlin): fix the kotlin file name. * delete blank line in main function * add comment for class head. * delete the old file. * fix the created time * delete blank line beneath files. --------- Co-authored-by: Yudong Jin <krahets@163.com>
50 lines
No EOL
1.4 KiB
Kotlin
50 lines
No EOL
1.4 KiB
Kotlin
/**
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* File: hashing_search.kt
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* Created Time: 2024-01-25
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* Author: curtishd (1023632660@qq.com)
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*/
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package chapter_searching
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import utils.ListNode
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import java.util.HashMap
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/* 哈希查找（数组） */
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fun hashingSearchArray(map: Map<Int?, Int>, target: Int): Int {
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// 哈希表的 key: 目标元素，value: 索引
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// 若哈希表中无此 key ，返回 -1
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return map.getOrDefault(target, -1)
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}
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/* 哈希查找（链表） */
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fun hashingSearchLinkedList(map: Map<Int?, ListNode?>, target: Int): ListNode? {
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// 哈希表的 key: 目标节点值，value: 节点对象
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// 若哈希表中无此 key ，返回 null
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return map.getOrDefault(target, null)
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}
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/* Driver Code */
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fun main() {
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val target = 3
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/* 哈希查找（数组） */
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val nums = intArrayOf(1, 5, 3, 2, 4, 7, 5, 9, 10, 8)
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// 初始化哈希表
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val map = HashMap<Int?, Int>()
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for (i in nums.indices) {
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map[nums[i]] = i // key: 元素，value: 索引
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}
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val index = hashingSearchArray(map, target)
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println("目标元素 3 的索引 = $index")
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/* 哈希查找（链表） */
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var head = ListNode.arrToLinkedList(nums)
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// 初始化哈希表
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val map1 = HashMap<Int?, ListNode?>()
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while (head != null) {
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map1[head.value] = head // key: 节点值，value: 节点
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head = head.next
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}
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val node = hashingSearchLinkedList(map1, target)
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println("目标节点值 3 的对应节点对象为 $node")
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} |