translation: Add Python and Java code for EN version (#1345)

* Add the intial translation of code of all the languages

* test

* revert

* Remove

* Add Python and Java code for EN version

en/codes/python/chapter_dynamic_programming/climbing_stairs_backtrack.py

@@ -0,0 +1,37 @@
+"""
+File: climbing_stairs_backtrack.py
+Created Time: 2023-06-30
+Author: krahets (krahets@163.com)
+"""
+
+
+def backtrack(choices: list[int], state: int, n: int, res: list[int]) -> int:
+    """Backtracking"""
+    # When climbing to the nth step, add 1 to the number of solutions
+    if state == n:
+        res[0] += 1
+    # Traverse all choices
+    for choice in choices:
+        # Pruning: do not allow climbing beyond the nth step
+        if state + choice > n:
+            continue
+        # Attempt: make a choice, update the state
+        backtrack(choices, state + choice, n, res)
+        # Retract
+
+
+def climbing_stairs_backtrack(n: int) -> int:
+    """Climbing stairs: Backtracking"""
+    choices = [1, 2]  # Can choose to climb up 1 step or 2 steps
+    state = 0  # Start climbing from the 0th step
+    res = [0]  # Use res[0] to record the number of solutions
+    backtrack(choices, state, n, res)
+    return res[0]
+
+
+"""Driver Code"""
+if __name__ == "__main__":
+    n = 9
+
+    res = climbing_stairs_backtrack(n)
+    print(f"Climb {n} steps, there are {res} solutions in total")