A10688 | PolandBall and Gifts
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题目描述
It's Christmas time! PolandBall and his friends will be giving themselves gifts. There are $n$ Balls overall. Each Ball has someone for whom he should bring a present according to some permutation $p$ , $p_{i}≠i$ for all $i$ .
Unfortunately, Balls are quite clumsy. We know earlier that exactly $k$ of them will forget to bring their gift. A Ball number $i$ will get his present if the following two constraints will hold:
1. Ball number $i$ will bring the present he should give.
2. Ball $x$ such that $p_{x}=i$ will bring his present.
What is minimum and maximum possible number of kids who will not get their present if exactly $k$ Balls will forget theirs?
Unfortunately, Balls are quite clumsy. We know earlier that exactly $k$ of them will forget to bring their gift. A Ball number $i$ will get his present if the following two constraints will hold:
1. Ball number $i$ will bring the present he should give.
2. Ball $x$ such that $p_{x}=i$ will bring his present.
What is minimum and maximum possible number of kids who will not get their present if exactly $k$ Balls will forget theirs?
输入格式
The first line of input contains two integers $n$ and $k$ ( $2<=n<=10^{6}$ , $0<=k<=n$ ), representing the number of Balls and the number of Balls who will forget to bring their presents.
The second line contains the permutation $p$ of integers from $1$ to $n$ , where $p_{i}$ is the index of Ball who should get a gift from the $i$ -th Ball. For all $i$ , $p_{i}≠i$ holds.
The second line contains the permutation $p$ of integers from $1$ to $n$ , where $p_{i}$ is the index of Ball who should get a gift from the $i$ -th Ball. For all $i$ , $p_{i}≠i$ holds.
输出格式
You should output two values — minimum and maximum possible number of Balls who will not get their presents, in that order.
输入输出样例
输入 #1
5 2 3 4 1 5 2
输出 #1
2 4
输入 #2
10 1 2 3 4 5 6 7 8 9 10 1
输出 #2
2 2
In the first sample, if the third and the first balls will forget to bring their presents, they will be th only balls not getting a present. Thus the minimum answer is $2$ . However, if the first ans the second balls will forget to bring their presents, then only the fifth ball will get a present. So, the maximum answer is $4$ .
C++ 编辑器
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评测结果:Accepted