# ---
# title: 171. Excel Sheet Column Number
# id: problem171
# author: Tian Jun
# date: 2020-10-31
# difficulty: Easy
# categories: Math
# link: <https://leetcode.com/problems/excel-sheet-column-number/description/>
# hidden: true
# ---
# 
# Given a column title as appear in an Excel sheet, return its corresponding
# column number.
# 
# For example:
# 
#     
#     
#         A -> 1
#         B -> 2
#         C -> 3
#         ...
#         Z -> 26
#         AA -> 27
#         AB -> 28 
#         ...
#     
# 
# **Example 1:**
# 
#     
#     
#     Input: "A"
#     Output: 1
#     
# 
# **Example 2:**
# 
#     
#     
#     Input: "AB"
#     Output: 28
#     
# 
# **Example 3:**
# 
#     
#     
#     Input: "ZY"
#     Output: 701
#     
# 
# 
# 
# **Constraints:**
# 
#   * `1 <= s.length <= 7`
#   * `s` consists only of uppercase English letters.
#   * `s` is between "A" and "FXSHRXW".
# 
# 
## @lc code=start
using LeetCode

## add your code here:
## @lc code=end
