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80 lines
2.7 KiB
80 lines
2.7 KiB
// File: heap.zig
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// Created Time: 2023-01-14
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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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fn lessThan(context: void, a: i32, b: i32) std.math.Order {
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_ = context;
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return std.math.order(a, b);
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}
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fn greaterThan(context: void, a: i32, b: i32) std.math.Order {
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return lessThan(context, a, b).invert();
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}
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fn testPush(comptime T: type, mem_allocator: std.mem.Allocator, heap: anytype, val: T) !void {
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try heap.add(val); //元素入堆
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std.debug.print("\n元素 {} 入堆后\n", .{val});
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try inc.PrintUtil.printHeap(T, mem_allocator, heap);
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}
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fn testPop(comptime T: type, mem_allocator: std.mem.Allocator, heap: anytype) !void {
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var val = heap.remove(); //堆顶元素出堆
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std.debug.print("\n堆顶元素 {} 出堆后\n", .{val});
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try inc.PrintUtil.printHeap(T, mem_allocator, heap);
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}
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// Driver Code
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pub fn main() !void {
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// 初始化内存分配器
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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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// 初始化堆
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// 初始化小顶堆
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const PQlt = std.PriorityQueue(i32, void, lessThan);
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var min_heap = PQlt.init(std.heap.page_allocator, {});
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defer min_heap.deinit();
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// 初始化大顶堆
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const PQgt = std.PriorityQueue(i32, void, greaterThan);
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var max_heap = PQgt.init(std.heap.page_allocator, {});
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defer max_heap.deinit();
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std.debug.print("\n以下测试样例为大顶堆", .{});
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// 元素入堆
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try testPush(i32, mem_allocator, &max_heap, 1);
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try testPush(i32, mem_allocator, &max_heap, 3);
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try testPush(i32, mem_allocator, &max_heap, 2);
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try testPush(i32, mem_allocator, &max_heap, 5);
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try testPush(i32, mem_allocator, &max_heap, 4);
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// 获取堆顶元素
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var peek = max_heap.peek().?;
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std.debug.print("\n堆顶元素为 {}\n", .{peek});
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// 堆顶元素出堆
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try testPop(i32, mem_allocator, &max_heap);
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try testPop(i32, mem_allocator, &max_heap);
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try testPop(i32, mem_allocator, &max_heap);
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try testPop(i32, mem_allocator, &max_heap);
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try testPop(i32, mem_allocator, &max_heap);
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// 获取堆的大小
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var size = max_heap.len;
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std.debug.print("\n堆元素数量为 {}\n", .{size});
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// 判断堆是否为空
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var is_empty = if (max_heap.len == 0) true else false;
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std.debug.print("\n堆是否为空 {}\n", .{is_empty});
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// 输入列表并建堆
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try min_heap.addSlice(&[_]i32{ 1, 3, 2, 5, 4 });
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std.debug.print("\n输入列表并建立小顶堆后\n", .{});
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try inc.PrintUtil.printHeap(i32, mem_allocator, min_heap);
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_ = try std.io.getStdIn().reader().readByte();
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} |