Go notes

concurrency.go

func main(){
  wg := &sync.WaitGroup{}
	for i := 0; i < 10; i++ {
		wg.Add(1)

		go func(i int) {
			defer wg.Done()
			time.Sleep(time.Duration(rand.Intn(90)) * time.Millisecond)

			msg := "echo" + strconv.Itoa(i)
			fmt.Println(msg)
		}(i)
	}
	for i := 0; i < 10; i++ {
		wg.Add(1)

		go func(i int) {
			defer wg.Done()
			time.Sleep(50 * time.Millisecond)
			msg := "echo() " + strconv.Itoa(i)
			fmt.Println(msg)
		}(i)
	}
	wg.Wait()
}

func main(){
ch := make(chan int)
	wg := &sync.WaitGroup{}
	for i := 100; i < 1000; i++ {
		for j := 100; j < 1000; j++ {
			num := i * j
			go func(num int) {
				if num <= t && num >100000 && isPalindrom(num) {
					wg.Add(1)
					ch <- num
				}
			}(num)

		}

	}

	bst := BST{}
	go func() {
		for c := range ch {
			fmt.Printf("c is %v\n", c)
			bst.Insert(int64(c))
			wg.Done()
		}
	}()
	wg.Wait()

	max, _ := bst.Max();
	fmt.Printf("max is %v\n",max)

}