There are 20 people in an elderly performance team in Tai Ji Chuan. The captain needs to inform them to put on their costumes the next morning as soon as possible. If you call, 1 people will be notified every minute. Please help the captain design a call plan.
Solution: the first minute 1 person, plus 2 team leaders, 4 in the second minute, 8 in the third minute, 0/6 in the fourth minute, 32 in the fifth minute, 32 > 20, so you can notify * * * in 5 minutes.