Create Spiral_Matrix_II.py

Author: Ram-95

Leetcode_30day_challenge/Spiral_Matrix_II.py

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+class Solution:
+    def generateMatrix(self, n: int) -> List[List[int]]:        
+        mat = [[0  for _ in range(n)] for _ in range(n)]
+        key = 1
+        top, down, right, left = 0, n, n, 0
+        
+        # Directions - 0 -> left to right; 1 -> top to down; 
+        # 2 -> right to left; 3 -> down to top
+        d = 0
+        while left <= right and top <= down:
+            if d == 0:  # Move from Left to right
+                for i in range(left, right):
+                    mat[top][i] = key
+                    key += 1
+                top += 1
+                d = 1
+            elif d == 1:    # Move from Top to Down
+                for i in range(top, down):
+                    mat[i][right-1] = key
+                    key += 1
+                right -= 1
+                d = 2
+            elif d == 2:    # Move from right to left
+                for i in range(right-1, left-1,-1):
+                    mat[down-1][i] = key
+                    key += 1
+                down -= 1
+                d = 3
+            elif d == 3:    # Move from down to top
+                for i in range(down-1, top-1, -1):
+                    mat[i][left] = key
+                    key += 1
+                left += 1
+                d = 0
+        
+        return mat
+                
+