diff --git a/26/03/3643.go b/26/03/3643.go
new file mode 100644
index 0000000..8b80b19
--- /dev/null
+++ b/26/03/3643.go
@@ -0,0 +1,12 @@
+package main
+
+func reverseSubmatrix(grid [][]int, x int, y int, k int) [][]int {
+	for i := 0; i < k/2; i++ {
+		for j := range k {
+			temp := grid[x+k-1-i][y+j]
+			grid[x+k-1-i][y+j] = grid[x+i][y+j]
+			grid[x+i][y+j] = temp
+		}
+	}
+	return grid
+}
diff --git a/main.c b/main.c
deleted file mode 100644
index e69de29..0000000