add new solutions

solutions/8/q841/solution.go

@@ -0,0 +1,23 @@
+package q841
+
+func canVisitAllRooms(rooms [][]int) bool {
+	locked := len(rooms) - 1
+
+	opened := make([]bool, len(rooms))
+	opened[0] = true
+
+	queue := []int{0}
+	for ; len(queue) > 0; queue = queue[1:] {
+		for _, i := range rooms[queue[0]] {
+			if opened[i] {
+				continue
+			}
+			opened[i] = true
+			locked--
+			queue = append(queue, i)
+		}
+	}
+	return locked == 0
+}
+
+var _ = canVisitAllRooms