created csharp/0059-spiral-matrix-ii.cs

csharp/0059-spiral-matrix-ii.cs

@@ -0,0 +1,50 @@
+public class Solution 
+{
+    public int[][] GenerateMatrix(int n)
+    {
+        var grid = new int[n][];
+        for (int i = 0; i < n; i++)
+        {
+            grid[i] = new int[n];
+        }
+
+        int top = 0, bottom = n - 1;
+        int left = 0, right = n - 1;
+        int value = 1;
+
+        while (top <= bottom && left <= right)
+        {
+            for (int col = left; col <= right; col++)
+            {
+                grid[top][col] = value++;
+            }
+            top++;
+
+            for (int row = top; row <= bottom; row++)
+            {
+                grid[row][right] = value++;
+            }
+            right--;
+
+            if (top <= bottom)
+            {
+                for (int col = right; col >= left; col--)
+                {
+                    grid[bottom][col] = value++;
+                }
+                bottom--;
+            }
+
+            if (left <= right)
+            {
+                for (int row = bottom; row >= top; row--)
+                {
+                    grid[row][left] = value++;
+                }
+                left++;
+            }
+        }
+
+        return grid;
+    }
+}