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Given a string columnTitle that represents the column title as appears in an Excel sheet, return its corresponding column number.

Given a string columnTitle that represents the column title as appears in an Excel sheet, return its corresponding column number.

Input: "A"

Output: 1

arr ="A"

Convert to number

A = 1× 26⁰

1 × 26⁰ = 0

Column Title

"A"

→

Column Number

Position: 0/1

Current sum: 0

Base-26 system: A=1, B=2, ..., Z=26

Variables

Variable	Value
columnTitle	A

DepthFunction Call

Stack empty

0/2