# Solving Leetcode Interviews in Seconds with AI: Cells in a Range on an Excel Sheet


	# Introduction
	In this blog post, we will explore how to solve the LeetCode problem "2194" using AI. LeetCode is a popular platform for preparing for coding interviews, and with the help of AI tools like [Chatmagic](https://www.chatmagic.app), we can generate solutions quickly and efficiently - helping you pass the interviews and get the job offer without having to study for months.

	# Problem Statement
	> 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.    Constraints:  s.length == 5 'A' <= s[0] <= s[3] <= 'Z' '1' <= s[1] <= s[4] <= '9' s consists of uppercase English letters, digits and ':'.  

	# Explanation
	Here's a breakdown of the solution:

*   **Parse Input:** Extract the column and row ranges from the input string. Convert the column letters into numerical representation.
*   **Iterate and Generate:** Iterate through all rows and columns within the specified ranges, creating the cell string representation for each cell.
*   **Store and Return:** Store each generated cell string in a list and return the list.

*   **Runtime Complexity:** O(R * C), where R is the number of rows and C is the number of columns in the range.
*   **Storage Complexity:** O(R * C), to store the generated cell strings.

	
	# Code
	```python
	def cellsInRange(s: str) -> list[str]:
    """
    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.
    """

    start_col = s[0]
    start_row = int(s[1])
    end_col = s[3]
    end_row = int(s[4])

    result = []
    for col in range(ord(start_col), ord(end_col) + 1):
        for row in range(start_row, end_row + 1):
            result.append(chr(col) + str(row))

    return result
	```