feat: added alternative python solutions.

decode-ways/problem.json

@@ -43,7 +43,7 @@
     },
     "solutions": {
         "main-ac": "ac.cpp",
-        "alternative-ac": ["alternative_ac.cpp"],
+        "alternative-ac": ["alternative_ac.cpp", "alternative-ac2.py"],
         "wrong-answer": [],
         "time-limit": ["TLE.cpp"],
         "time-limit-or-ac": [],

decode-ways/src/alternative-ac2.py

@@ -0,0 +1,16 @@
+n = int(input())
+s = input().strip()
+
+dp = [0] * (n + 1)
+dp[0] = 1
+
+for i in range(1, n + 1):
+    if s[i - 1] != '0':
+        dp[i] += dp[i - 1]
+    
+    if i > 1:
+        two_digit = int(s[i - 2:i])
+        if 10 <= two_digit <= 26:
+            dp[i] += dp[i - 2]
+
+print(dp[n])