Solving Decode Ways using DP.

Problem

Count decodings.

Pattern

This problem demonstrates the DP pattern.

Approach

Handle ‘0’, single and double digit.

Solution 

  // Solution for Decode Ways
// Pattern: DP
// O(n) time

Complexity

O(n) time

Best Practices

  • Identify the pattern before coding — pattern recognition saves time
  • Handle edge cases: empty input, single element, duplicates
  • Use descriptive variable names even in timed interviews
  • Test with the provided examples plus one custom case