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medium
DP

Decode Ways

**Problem Statement:** Given the required input arguments, write an efficient algorithm to solve the **Decode Ways** problem. Implement the required logic as specified by standard definitions for this classic algorithmic challenge. **Hint / Expected Approach:** DP with leading zero and range 10–26 checks **Edge Cases to Consider:** - (1) String starting with '0' - (2) "10" or "20" - (3) All same digit '1'

Examples

Example 1
Input: "12"
Output: 2
Explanation: "AB" or "L"
Example 2
Input: "226"
Output: 3
Explanation: "BZ","VF","BBF"
Example 3
Input: "0"
Output: 0
Explanation: Starts with 0

Constraints

  • ▪Input arguments are within valid ranges
  • ▪Optimize for execution speed
  • ▪Handle null/empty inputs gracefully

Watch Out For Edge Cases

  • ▪String starting with '0'
  • ▪"10" or "20"
  • ▪All same digit '1'
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