docs: add Japanese translate documents (#1812)

* docs: add Japanese documents (`ja/docs`)

* docs: add Japanese documents (`ja/codes`)

* docs: add Japanese documents

* Remove pythontutor blocks in ja/

* Add an empty at the end of each markdown file.

* Add the missing figures (use the English version temporarily).

* Add index.md for Japanese version.

* Add index.html for Japanese version.

* Add missing index.assets

* Fix backtracking_algorithm.md for Japanese version.

* Add avatar_eltociear.jpg. Fix image links on the Japanese landing page.

* Add the Japanese banner.

---------

Co-authored-by: krahets <krahets@163.com>

ja/codes/python/chapter_hashing/array_hash_map.py

@@ -0,0 +1,117 @@
+"""
+File: array_hash_map.py
+Created Time: 2022-12-14
+Author: msk397 (machangxinq@gmail.com)
+"""
+
+
+class Pair:
+    """キー値ペア"""
+
+    def __init__(self, key: int, val: str):
+        self.key = key
+        self.val = val
+
+
+class ArrayHashMap:
+    """配列実装に基づくハッシュテーブル"""
+
+    def __init__(self):
+        """コンストラクタ"""
+        # 100個のバケットを含む配列を初期化
+        self.buckets: list[Pair | None] = [None] * 100
+
+    def hash_func(self, key: int) -> int:
+        """ハッシュ関数"""
+        index = key % 100
+        return index
+
+    def get(self, key: int) -> str:
+        """照会操作"""
+        index: int = self.hash_func(key)
+        pair: Pair = self.buckets[index]
+        if pair is None:
+            return None
+        return pair.val
+
+    def put(self, key: int, val: str):
+        """追加操作"""
+        pair = Pair(key, val)
+        index: int = self.hash_func(key)
+        self.buckets[index] = pair
+
+    def remove(self, key: int):
+        """削除操作"""
+        index: int = self.hash_func(key)
+        # None に設定し、削除を表現
+        self.buckets[index] = None
+
+    def entry_set(self) -> list[Pair]:
+        """すべてのキー値ペアを取得"""
+        result: list[Pair] = []
+        for pair in self.buckets:
+            if pair is not None:
+                result.append(pair)
+        return result
+
+    def key_set(self) -> list[int]:
+        """すべてのキーを取得"""
+        result = []
+        for pair in self.buckets:
+            if pair is not None:
+                result.append(pair.key)
+        return result
+
+    def value_set(self) -> list[str]:
+        """すべての値を取得"""
+        result = []
+        for pair in self.buckets:
+            if pair is not None:
+                result.append(pair.val)
+        return result
+
+    def print(self):
+        """ハッシュテーブルを出力"""
+        for pair in self.buckets:
+            if pair is not None:
+                print(pair.key, "->", pair.val)
+
+
+"""Driver Code"""
+if __name__ == "__main__":
+    # ハッシュテーブルを初期化
+    hmap = ArrayHashMap()
+
+    # 追加操作
+    # キー値ペア (key, value) をハッシュテーブルに追加
+    hmap.put(12836, "Ha")
+    hmap.put(15937, "Luo")
+    hmap.put(16750, "Suan")
+    hmap.put(13276, "Fa")
+    hmap.put(10583, "Ya")
+    print("\n追加後、ハッシュテーブルは\nKey -> Value")
+    hmap.print()
+
+    # 照会操作
+    # ハッシュテーブルにキーを入力し、値を取得
+    name = hmap.get(15937)
+    print("\n学生ID 15937 を入力、名前 " + name + " が見つかりました")
+
+    # 削除操作
+    # ハッシュテーブルからキー値ペア (key, value) を削除
+    hmap.remove(10583)
+    print("\n10583 を削除後、ハッシュテーブルは\nKey -> Value")
+    hmap.print()
+
+    # ハッシュテーブルを走査
+    print("\nキー値ペアを走査 Key->Value")
+    for pair in hmap.entry_set():
+        print(pair.key, "->", pair.val)
+
+    print("\nキーを個別に走査 Key")
+    for key in hmap.key_set():
+        print(key)
+
+    print("\n値を個別に走査 Value")
+    for val in hmap.value_set():
+        print(val)