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  • cf287D Shifting

    John Doe has found the beautiful permutation formula.

    Let's take permutation p = p1, p2, ..., pn. Let's define transformation f of this permutation:

    where k (k > 1) is an integer, the transformation parameter, r is such maximum integer that rk ≤ n. If rk = n, then elements prk + 1, prk + 2 and so on are omitted. In other words, the described transformation of permutation p cyclically shifts to the left each consecutive block of length k and the last block with the length equal to the remainder after dividing n by k.

    John Doe thinks that permutation f(f( ... f(p = [1, 2, ..., n], 2) ... , n - 1), n) is beautiful. Unfortunately, he cannot quickly find the beautiful permutation he's interested in. That's why he asked you to help him.

    Your task is to find a beautiful permutation for the given n. For clarifications, see the notes to the third sample.

    Input

    A single line contains integer n (2 ≤ n ≤ 106).

    Output

    Print n distinct space-separated integers from 1 to n — a beautiful permutation of size n.

    Examples
    Input
    2
    Output
    2 1 
    Input
    3
    Output
    1 3 2 
    Input
    4
    Output
    4 2 3 1 
    Note

    A note to the third test sample:

    • f([1, 2, 3, 4], 2) = [2, 1, 4, 3]
    • f([2, 1, 4, 3], 3) = [1, 4, 2, 3]
    • f([1, 4, 2, 3], 4) = [4, 2, 3, 1]

    在每次变换的时候,都是取一个长度是t的区间,然后把区间的第一个元素放末尾

    那么只要每次把所有这样长度为t的区间的a[kt+1]放到a[kt+t+1]即可。

    比如样例的变换:

    1 2 3 4 0 0 0

    0 2 1 4 3 0 0

    0 0 1 4 2 3 0

    0 0 0 4 2 3 1

    这样每次元素在数组当中的位置都会往后移一位,但是总长度还是n

     1 #include<cstdio>
     2 #include<iostream>
     3 #include<cstring>
     4 #include<cstdlib>
     5 #include<algorithm>
     6 #include<cmath>
     7 #include<queue>
     8 #include<deque>
     9 #include<set>
    10 #include<map>
    11 #include<ctime>
    12 #define LL long long
    13 #define inf 0x7ffffff
    14 #define pa pair<int,int>
    15 #define mkp(a,b) make_pair(a,b)
    16 #define pi 3.1415926535897932384626433832795028841971
    17 using namespace std;
    18 inline LL read()
    19 {
    20     LL x=0,f=1;char ch=getchar();
    21     while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
    22     while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
    23     return x*f;
    24 }
    25 int n;
    26 int a[2000010];
    27 int main()
    28 {
    29     while (~scanf("%d",&n))
    30     {
    31         for (int i=1;i<=n;i++)a[i]=i;
    32         for (int k=2;k<=n;k++)
    33         {
    34             int ed=n+k-1,rp=n/k+(n%k!=0);
    35             for (int t=k-1+(rp-1)*k;t>=k-1;t-=k)
    36             {
    37                 swap(a[ed],a[t]);
    38                 ed=t;
    39             }
    40         }
    41         for (int i=n;i<=2*n-1;i++)printf("%d ",a[i]);
    42         puts("");
    43     }
    44 }
    cf 287D
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  • 原文地址:https://www.cnblogs.com/zhber/p/7283369.html
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