[LeetCode]#2194. Cells in a Range on an Excel Sheet

Environment: Python 3.8

Key technique: chr, ord, for

A cell (r, c) of an excel sheet is represented as a string "<col><row>" where:

• <col> denotes the column number c of the cell. It is represented by alphabetical letters.
• For example, the 1st column is denoted by 'A', the 2nd by 'B', the 3rd by 'C', and so on.
• <row> is the row number r of the cell. The rth row is represented by the integer r.

You are given a string s in the format "<col1><row1>:<col2><row2>", where <col1> represents the column c1, <row1> represents the row r1, <col2> represents the column c2, and <row2> represents the row r2, such that r1 <= r2 and c1 <= c2.

Return the list of cells (x, y) such that r1 <= x <= r2 and c1 <= y <= c2. The cells should be represented as strings in the format mentioned above and be sorted in non-decreasing order first by columns and then by rows.

Example 1:

Input: s = "K1:L2"
Output: ["K1","K2","L1","L2"]
Explanation:
The above diagram shows the cells which should be present in the list.
The red arrows denote the order in which the cells should be presented.

Example 2:

Input: s = "A1:F1"
Output: ["A1","B1","C1","D1","E1","F1"]
Explanation:
The above diagram shows the cells which should be present in the list.
The red arrow denotes the order in which the cells should be presented.

Analysis:

1. Convert the letter to a number such as “A” to 65.
2. Let “1” as int.
3. Use for loop to list all root.

Solution:

class Solution:
    def cellsInRange(self, s):
        ans=[]
        
        for i in range(ord(s[0]),ord(s[3])+1):
            for j in range(int(s[1]),int(s[4])+1):
ans.append(chr(i)+str(j))
        return ans

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