add new solutions

solutions/1/q130/solution.go

@@ -0,0 +1,37 @@
+package q130
+
+func markI(board [][]byte, x, y int) {
+	w, h := len(board[0]), len(board)
+	if x < 0 || y < 0 || x >= w || y >= h || board[y][x] != 'O' {
+		return
+	}
+	board[y][x] = 'I'
+	markI(board, x, y+1)
+	markI(board, x, y-1)
+	markI(board, x+1, y)
+	markI(board, x-1, y)
+}
+
+func solve(board [][]byte) {
+	for i := range len(board) {
+		markI(board, 0, i)
+		markI(board, len(board[0])-1, i)
+	}
+	for i := range len(board[0]) {
+		markI(board, i, 0)
+		markI(board, i, len(board)-1)
+	}
+
+	for y := range board {
+		for x := range board[0] {
+			switch board[y][x] {
+			case 'O':
+				board[y][x] = 'X'
+			case 'I':
+				board[y][x] = 'O'
+			}
+		}
+	}
+}
+
+var _ = solve