A8048. Disposition
编程题
普及/提高-
知识点
题目描述
Vasya bought the collected works of a well-known Berland poet Petya in $n$ volumes. The volumes are numbered from $1$ to $n$ . He thinks that it does not do to arrange the book simply according to their order. Vasya wants to minimize the number of the disposition’s divisors — the positive integers $i$ such that for at least one $j$ ( $1<=j<=n$ ) is true both: $j$ $mod$ $i=0$ and at the same time $p(j)$ $mod$ $i=0$ , where $p(j)$ is the number of the tome that stands on the $j$ -th place and $mod$ is the operation of taking the division remainder. Naturally, one volume can occupy exactly one place and in one place can stand exactly one volume.
Help Vasya — find the volume disposition with the minimum number of divisors.
Help Vasya — find the volume disposition with the minimum number of divisors.
输入格式
The first line contains number $n$ ( $1<=n<=100000$ ) which represents the number of volumes and free places.
输出格式
Print $n$ numbers — the sought disposition with the minimum divisor number. The $j$ -th number ( $1<=j<=n$ ) should be equal to $p(j)$ — the number of tome that stands on the $j$ -th place. If there are several solutions, print any of them.
输入输出样例
输入 #1
2
输出 #1
2 1
输入 #2
3
输出 #2
1 3 2