2194 - Cells in a Range on an Excel Sheet.

Easy

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.

• <row> is the row number r of the cell. The <code>r^th</code> 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.

Constraints:

• s.length == 5

• 'A' <= s[0] <= s[3] <= 'Z'

• '1' <= s[1] <= s[4] <= '9'

• s consists of uppercase English letters, digits and ':'.