[#3195] feat(MinimumArea): add C# solution

202508/3195 minimumArea/C#/Program.cs

@@ -0,0 +1,28 @@
+public class Solution {
+    public int MinimumArea(int[][] grid)
+    {
+        var x = grid[0].Length;
+        var y = grid.Length;
+
+        int min_x = x;
+        int max_x = 0;
+        int min_y = y;
+        int max_y = 0;
+
+        for (var i = 0; i < x; i++)
+        {
+            for (var j = 0; j < y; j++)
+            {
+                if (grid[j][i])
+                {
+                    min_x = Math.Min(min_x, i);
+                    max_x = Math.Max(max_x, i);
+                    min_y = Math.Min(min_y, j);
+                    max_y = Math.Max(max_y, j);
+                }
+            }
+        }
+
+        return (max_x - min_x + 1) * (max_y - min_y + 1);
+    }
+}