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Decode Ways

Medium

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Given a string of digits, count the number of ways to decode it as letters (1-26 -> A-Z).

Sample Input:

"12"

Sample Output:

Hints

Hint 1

Use dynamic programming to count ways at each position

Hint 2

Check single digit and two-digit combinations

Hint 3

Handle zeros carefully (can't decode '0' alone)

Code Editor

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