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easy
Math

Excel Sheet Column Number

**Problem Statement:** Given the required input arguments, write an efficient algorithm to solve the **Excel Sheet Column Number** problem. Implement the required logic as specified by standard definitions for this classic algorithmic challenge. **Hint / Expected Approach:** Base-26 conversion (no zero digit) **Edge Cases to Consider:** - (1) Single letter 'A' - (2) 'Z' (26) - (3) Column beyond 'ZZ'

Examples

Example 1
Input: "A"
Output: 1
Example 2
Input: "B"
Output: 2
Example 3
Input: "Z"
Output: 26

Constraints

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

Watch Out For Edge Cases

  • ▪Single letter 'A'
  • ▪'Z'
  • ▪Column beyond 'ZZ'
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