Pick two distinct random numbers efficiently

main.go

package main

import (
	"fmt"
	"math/rand"
)

// (repeatedly) picks 2 distinct random numbers from a range, avoids looping in case of clashes
func main() {
	l := 10
	for i := 0; i < 5000; i++ {
		a, b := rand.Intn(l), rand.Intn(l-1)
		if b >= a {
			b++
		}
		fmt.Println(a, b)
	}
}