1 1:11person,1person, 12 person,1person; 6 people, each 2 yuan; 4 people, each 3 yuan; 3 people, each 4 yuan; 2 persons, each in 6 yuan: 13 yuan: 13 persons, 1 yuan: 14 yuan, 14 yuan; 7 people, each 2 yuan; 2 people, each 7 yuan 15 yuan: 15 people, each person 1 yuan; 5 people, each 3 yuan; 3 people, each 5 yuan 16 yuan: 16 people, each 1 yuan; 8 people, each 2 yuan; 4 people, each 4 yuan; 2 people, each 8 yuan; 17: 17, 1 person, 18, 1 person; 9 people, each 2 yuan; 6 people, each 3 yuan, 3 people, each 6 yuan; 2 people, each 9 yuan 19 yuan: 19 people, each 1 yuan. If everyone eats the same number of pieces as the number of people, it should be 16 snack, 4 people.