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63 lines
1.9 KiB
63 lines
1.9 KiB
// File: TreeNode.zig
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// Created Time: 2023-01-07
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// Author: codingonion (coderonion@gmail.com)
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const std = @import("std");
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// 二元樹節點
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pub fn TreeNode(comptime T: type) type {
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return struct {
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const Self = @This();
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val: T = undefined, // 節點值
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height: i32 = undefined, // 節點高度
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left: ?*Self = null, // 左子節點指標
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right: ?*Self = null, // 右子節點指標
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// Initialize a tree node with specific value
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pub fn init(self: *Self, x: i32) void {
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self.val = x;
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self.height = 0;
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self.left = null;
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self.right = null;
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}
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};
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}
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// 將陣列反序列化為二元樹
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pub fn arrToTree(comptime T: type, mem_allocator: std.mem.Allocator, arr: []T) !?*TreeNode(T) {
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if (arr.len == 0) return null;
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var root = try mem_allocator.create(TreeNode(T));
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root.init(arr[0]);
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const L = std.TailQueue(*TreeNode(T));
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var que = L{};
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var root_node = try mem_allocator.create(L.Node);
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root_node.data = root;
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que.append(root_node);
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var index: usize = 0;
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while (que.len > 0) {
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var que_node = que.popFirst().?;
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var node = que_node.data;
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index += 1;
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if (index >= arr.len) break;
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if (index < arr.len) {
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var tmp = try mem_allocator.create(TreeNode(T));
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tmp.init(arr[index]);
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node.left = tmp;
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var tmp_node = try mem_allocator.create(L.Node);
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tmp_node.data = node.left.?;
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que.append(tmp_node);
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}
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index += 1;
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if (index >= arr.len) break;
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if (index < arr.len) {
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var tmp = try mem_allocator.create(TreeNode(T));
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tmp.init(arr[index]);
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node.right = tmp;
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var tmp_node = try mem_allocator.create(L.Node);
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tmp_node.data = node.right.?;
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que.append(tmp_node);
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}
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}
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return root;
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} |