mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-25 15:06:30 +08:00
7ffef7e1d6
* update author information * Update index.md --------- Co-authored-by: Yudong Jin <krahets@163.com>
57 lines
2 KiB
Zig
57 lines
2 KiB
Zig
// File: hashing_search.zig
|
||
// Created Time: 2023-01-15
|
||
// Author: codingonion (coderonion@gmail.com)
|
||
|
||
const std = @import("std");
|
||
const inc = @import("include");
|
||
|
||
// 哈希查找（数组）
|
||
fn hashingSearchArray(comptime T: type, map: std.AutoHashMap(T, T), target: T) T {
|
||
// 哈希表的 key: 目标元素，value: 索引
|
||
// 若哈希表中无此 key ，返回 -1
|
||
if (map.getKey(target) == null) return -1;
|
||
return map.get(target).?;
|
||
}
|
||
|
||
// 哈希查找（链表）
|
||
fn hashingSearchLinkedList(comptime T: type, map: std.AutoHashMap(T, *inc.ListNode(T)), target: T) ?*inc.ListNode(T) {
|
||
// 哈希表的 key: 目标节点值，value: 节点对象
|
||
// 若哈希表中无此 key ，返回 null
|
||
if (map.getKey(target) == null) return null;
|
||
return map.get(target);
|
||
}
|
||
|
||
// Driver Code
|
||
pub fn main() !void {
|
||
var target: i32 = 3;
|
||
|
||
// 哈希查找（数组）
|
||
var nums = [_]i32{ 1, 5, 3, 2, 4, 7, 5, 9, 10, 8 };
|
||
// 初始化哈希表
|
||
var map = std.AutoHashMap(i32, i32).init(std.heap.page_allocator);
|
||
defer map.deinit();
|
||
for (nums, 0..) |num, i| {
|
||
try map.put(num, @as(i32, @intCast(i))); // key: 元素，value: 索引
|
||
}
|
||
var index = hashingSearchArray(i32, map, target);
|
||
std.debug.print("目标元素 3 的索引 = {}\n", .{index});
|
||
|
||
// 哈希查找（链表）
|
||
var mem_arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
|
||
defer mem_arena.deinit();
|
||
const mem_allocator = mem_arena.allocator();
|
||
var head = try inc.ListUtil.arrToLinkedList(i32, mem_allocator, &nums);
|
||
// 初始化哈希表
|
||
var map1 = std.AutoHashMap(i32, *inc.ListNode(i32)).init(std.heap.page_allocator);
|
||
defer map1.deinit();
|
||
while (head != null) {
|
||
try map1.put(head.?.val, head.?);
|
||
head = head.?.next;
|
||
}
|
||
var node = hashingSearchLinkedList(i32, map1, target);
|
||
std.debug.print("目标节点值 3 的对应节点对象为 ", .{});
|
||
try inc.PrintUtil.printLinkedList(i32, node);
|
||
|
||
_ = try std.io.getStdIn().reader().readByte();
|
||
}
|
||
|