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// File: hashing_search.zig
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// Created Time: 2023-01-15
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// Author: sjinzh (sjinzh@gmail.com)
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const std = @import("std");
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const inc = @import("include");
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// 哈希查找（数组）
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fn hashingSearchArray(comptime T: type, map: std.AutoHashMap(T, T), target: T) T {
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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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if (map.getKey(target) == null) return -1;
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return map.get(target).?;
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}
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// 哈希查找（链表）
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fn hashingSearchLinkedList(comptime T: type, map: std.AutoHashMap(T, *inc.ListNode(T)), target: T) ?*inc.ListNode(T) {
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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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if (map.getKey(target) == null) return null;
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return map.get(target);
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}
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// Driver Code
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pub fn main() !void {
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var target: i32 = 3;
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// 哈希查找（数组）
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var nums = [_]i32{ 1, 5, 3, 2, 4, 7, 5, 9, 10, 8 };
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// 初始化哈希表
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var map = std.AutoHashMap(i32, i32).init(std.heap.page_allocator);
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defer map.deinit();
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for (nums, 0..) |num, i| {
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try map.put(num, @as(i32, @intCast(i))); // key: 元素，value: 索引
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}
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var index = hashingSearchArray(i32, map, target);
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std.debug.print("目标元素 3 的索引 = {}\n", .{index});
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// 哈希查找（链表）
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var mem_arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
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defer mem_arena.deinit();
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const mem_allocator = mem_arena.allocator();
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var head = try inc.ListUtil.arrToLinkedList(i32, mem_allocator, &nums);
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// 初始化哈希表
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var map1 = std.AutoHashMap(i32, *inc.ListNode(i32)).init(std.heap.page_allocator);
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defer map1.deinit();
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while (head != null) {
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try map1.put(head.?.val, head.?);
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head = head.?.next;
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}
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var node = hashingSearchLinkedList(i32, map1, target);
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std.debug.print("目标节点值 3 的对应节点对象为 ", .{});
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try inc.PrintUtil.printLinkedList(i32, node);
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_ = try std.io.getStdIn().reader().readByte();
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}
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