Dynamic Programming pattern
Decode Ways
Letters A through Z map to the codes 1 through 26. Given a string of digits, return the number of distinct ways it can be decoded back into letters. Watch it run step by step, then write your own pseudocode and get it checked by AI.
- LeetCode 91
- Medium
- 1 approach
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Dynamic ProgrammingLeetCode 91
Medium
The approach
- 01 DP over prefixes O(n)O(n) space
What you will learn
- How to read Decode Ways and spot the dynamic programming pattern in it
- DP over prefixes: O(n) time, O(n) space
- The pseudocode for each approach, its line lit as the animation runs
- Practice: write your own pseudocode and get it checked
More Dynamic Programming
See Decode Ways run, step by step
Sign in and this page opens on the animation, with all 18 Dynamic Programming problems beside it.
DSA comes with the all labs plan and every ChaiCode batch.