fixing the typo

Author: SubhadipD9

data_structures/arrays/spiral_matrix.py

@@ -1,65 +1,62 @@
 class Solution:
     def generate_matrix(self, n: int) -> list[list[int]]:
-        # create an n x n matrix filled with zeros
+        """Generate an n x n spiral matrix filled with numbers from 1 to n^2."""
+
+        # Create an n x n matrix filled with zeros
         result = [[0] * n for _ in range(n)]
-        
+
         # Start filling numbers from 1 to n^2
         value = 1
-        
+
         # Define the boundaries for rows and columns
         row_start, row_end = 0, n - 1
         col_start, col_end = 0, n - 1
 
         # Continue filling the matrix layer by layer in spiral order
         while row_start <= row_end and col_start <= col_end:
-            
             # Step 1: Fill the top row (left → right)
-            for i in range(col_start, col_end + 1):
-                result[row_start][i] = value   # assign the current value
-                value += 1                    # move to next number
-            row_start += 1  # move top boundary down (row filled)
-            
+            for col in range(col_start, col_end + 1):
+                result[row_start][col] = value   # Assign the current value
+                value += 1                       # Move to next number
+            row_start += 1  # Move top boundary down (row filled)
+
             # Step 2: Fill the rightmost column (top → bottom)
-            for j in range(row_start, row_end + 1):
-                result[j][col_end] = value
+            for row in range(row_start, row_end + 1):
+                result[row][col_end] = value
                 value += 1
-            col_end -= 1  # move right boundary left (column filled)
-            
+            col_end -= 1  # Move right boundary left (column filled)
+
             # Step 3: Fill the bottom row (right → left)
             # Only if there are rows remaining to fill
             if row_start <= row_end:
-                for k in range(col_end, col_start - 1, -1):
-                    result[row_end][k] = value
+                for col in range(col_end, col_start - 1, -1):
+                    result[row_end][col] = value
                     value += 1
-                row_end -= 1  # move bottom boundary up (row filled)
-            
+                row_end -= 1  # Move bottom boundary up (row filled)
+
             # Step 4: Fill the leftmost column (bottom → top)
             # Only if there are columns remaining to fill
             if col_start <= col_end:
-                for l in range(row_end, row_start - 1, -1):
-                    result[l][col_start] = value
+                for row in range(row_end, row_start - 1, -1):
+                    result[row][col_start] = value
                     value += 1
-                
-                col_start += 1
+                col_start += 1  # Move left boundary right (column filled)
 
-        # return the completed spiral matrix
+        # Return the completed spiral matrix
         return result
 
 
-# example usage
-solution = Solution()
-n = 3  # change this to any number, e.g., 4 or 5
-matrix = solution.generate_matrix(n)
-
-# print the spiral matrix row by row
-for row in matrix:
-    print(row)
-
+# Example usage
+if __name__ == "__main__":
+    solution = Solution()
+    n = 3  # Change this to any number, e.g., 4 or 5
+    matrix = solution.generate_matrix(n)
 
-# Output: 
-'''
-    [1, 2, 3]
-    [8, 9, 4]
-    [7, 6, 5]
+    # Print the spiral matrix row by row
+    for row in matrix:
+        print(row)
 
-'''
+    # Output:
+    # [1, 2, 3]
+    # [8, 9, 4]
+    # [7, 6, 5]