Re-translate the Japanese version (#1871)

* Retranslate Japanese docs with GPT-5.4

* Retranslate Japanese code with GPT-5.4

ja/codes/zig/utils/TreeNode.zig

@@ -0,0 +1,63 @@
+// File: TreeNode.zig
+// Created Time: 2023-01-07
+// Author: codingonion (coderonion@gmail.com), CreatorMetaSky (creator_meta_sky@163.com)
+
+const std = @import("std");
+
+// 二分木ノード
+pub fn TreeNode(comptime T: type) type {
+    return struct {
+        const Self = @This();
+
+        val: T = undefined, // ノード値
+        height: i32 = undefined, // ノードの高さ
+        left: ?*Self = null, // 左の子ノードへのポインタ
+        right: ?*Self = null, // 右の子ノードへのポインタ
+
+        // Initialize a tree node with specific value
+        pub fn init(self: *Self, x: i32) void {
+            self.val = x;
+            self.height = 0;
+            self.left = null;
+            self.right = null;
+        }
+    };
+}
+
+// 配列をデシリアライズして二分木に変換する
+pub fn arrToTree(comptime T: type, allocator: std.mem.Allocator, arr: []T) !?*TreeNode(T) {
+    if (arr.len == 0) return null;
+    var root = try allocator.create(TreeNode(T));
+    root.init(arr[0]);
+    const L = std.TailQueue(*TreeNode(T));
+    var que = L{};
+    var root_node = try allocator.create(L.Node);
+    root_node.data = root;
+    que.append(root_node);
+    var index: usize = 0;
+    while (que.len > 0) {
+        const que_node = que.popFirst().?;
+        var node = que_node.data;
+        index += 1;
+        if (index >= arr.len) break;
+        if (index < arr.len) {
+            var tmp = try allocator.create(TreeNode(T));
+            tmp.init(arr[index]);
+            node.left = tmp;
+            var tmp_node = try allocator.create(L.Node);
+            tmp_node.data = node.left.?;
+            que.append(tmp_node);
+        }
+        index += 1;
+        if (index >= arr.len) break;
+        if (index < arr.len) {
+            var tmp = try allocator.create(TreeNode(T));
+            tmp.init(arr[index]);
+            node.right = tmp;
+            var tmp_node = try allocator.create(L.Node);
+            tmp_node.data = node.right.?;
+            que.append(tmp_node);
+        }
+    }
+    return root;
+}