1, select all big ships or all small ships (this method will have empty positions)
2. Choose a big boat first, and then choose a small boat after selecting a certain amount.
3. Choose a small boat first, and then choose a big boat after a certain amount.
In the latter two methods, it should be noted that a certain number is selected, that is to say, it is best to choose the remaining number that can be divisible by the number of large ships or small boats, so as not to waste positions.
For example, for 54 people, the boat can take 7 people and the boat can take 5 people, so the price is free.
The first method, to ensure that everyone can sit on it, is to rent 8 boats, 1 1 boats.
The second method, using the multiplication table of 99 to do mental arithmetic, found seven big ships, and the remaining five people just took a small boat.
In the third method, there are eight boats, and the remaining 14 people just sit on two big boats.
Anyway, the topic lets you choose the cost-effective one according to the price comparison. If you are asked to write a few methods, write it like this.