I thought about it for a long time. First of all, there won't be a *** 10 and 20 questions, because only two people can take even or odd numbers. But it doesn't prevent us from imagining how to control whether everyone gets odd or even numbers in even numbers.
When there are 1 matches, the first hand can only get odd numbers, that is, 1 matches must be taken.
When there are two matches, the first hand can control whether to get odd or even numbers.
When there are three matches, the first hand can control whether to get odd or even numbers.
So you can win by playing two or three games first.
When there are four matches, the first hand can only control the odd number and only get the odd number.
Explanation: When there are four matches, when there are four matches, you take 1 match, which becomes the situation that the other party has three matches first. In order to prevent the other party from controlling parity, you can't take 1 matches; Take two matches, it becomes the situation that the other party takes two matches first. In order to prevent the other party from controlling parity, you can't take two matches. So you can only get 3, and the other side gets 1.
After 4, you can start according to the above conclusion.
When there are five matches, the first hand can only get an even number.
When there are six matches, the first hand can control odd or even numbers.
When there are seven matches, the first hand can control odd or even numbers.
When there are eight matches, the first hand can only get an even number.
When there are nine matches, the first hand can only get odd numbers.
This cycle began later.
Write it again and read it clearly.
When there are 1 matches, the first hand can only get odd numbers.
The first hand can be controlled to get odd or even numbers.
3 can be controlled
4 odd number
5 even number
6 can be controlled
7 can be controlled
8 even numbers
9 odd number
10 can be controlled.
1 1 can be controlled.
12 odd number
13 even number
14 can be controlled
15 can be controlled.
16 even number
17 odd number
current
You can think about how many matches you should take under your control.
I have asked to add your friend, QQ32706 1403, and we can study it later.
Uh, I just found this. Look at it. I haven't seen it carefully.
/tech forum/Content/7 1/ 148985 . shhtml