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.

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

ja/codes/python/chapter_heap/top_k.py

@@ -0,0 +1,39 @@
+"""
+File: top_k.py
+Created Time: 2023-06-10
+Author: krahets (krahets@163.com)
+"""
+
+import sys
+from pathlib import Path
+
+sys.path.append(str(Path(__file__).parent.parent))
+from modules import print_heap
+
+import heapq
+
+
+def top_k_heap(nums: list[int], k: int) -> list[int]:
+    """ヒープを使用して配列内の最大k個の要素を見つける"""
+    # 最小ヒープを初期化
+    heap = []
+    # 配列の最初のk個の要素をヒープに入力
+    for i in range(k):
+        heapq.heappush(heap, nums[i])
+    # k+1番目の要素から、ヒープの長さをkに保つ
+    for i in range(k, len(nums)):
+        # 現在の要素がヒープの先頭要素より大きい場合、ヒープの先頭要素を削除し、現在の要素をヒープに入力
+        if nums[i] > heap[0]:
+            heapq.heappop(heap)
+            heapq.heappush(heap, nums[i])
+    return heap
+
+
+"""ドライバコード"""
+if __name__ == "__main__":
+    nums = [1, 7, 6, 3, 2]
+    k = 3
+
+    res = top_k_heap(nums, k)
+    print(f"最大の {k} 個の要素は")
+    print_heap(res)