标签:p2 line Codeforces test permutation 810 Div include cases
比赛链接
A. Perfect Permutation
原题链接
You are given a positive integer n
.
The weight of a permutation p1,p2,…,pn
is the number of indices 1≤i≤n
such that i
divides pi
. Find a permutation p1,p2,…,pn
with the minimum possible weight (among all permutations of length n).
A permutation is an array consisting of n distinct integers from 1 to n in arbitrary order. For example, [2,3,1,5,4]
is a permutation, but [1,2,2]
is not a permutation (2 appears twice in the array) and [1,3,4]
is also not a permutation (n=3 but there is 4 in the array).
Input
Each test contains multiple test cases. The first line contains the number of test cases t (1≤t≤10^4)
. The description of the test cases follows.
The only line of each test case contains a single integer n (1≤n≤10^5)
— the length of permutation.
It is guaranteed that the sum of n over all test cases does not exceed 10^5
.
Output
For each test case, print a line containing n
integers p1,p2,…,pn
so that the permutation p has the minimum possible weight.
If there are several possible answers, you can print any of them.
Example
input
2
1
4
outputCopy
1
2 1 4 3
题目大意
构造一个含1~n的长度为n的数列,满足 p[i]/i
有最小值。
因此只需要将数组向左移动一位就行。
代码
#include <iostream>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <algorithm>
using namespace std;
void solve()
{
int n;
cin >> n;
for(int i = 2;i <= n;i ++)
cout << i << " ";
cout << 1 << endl;
}
int main()
{
int T;
cin >> T;
while( T-- )
solve();
return 0;
}
标签:p2,line,Codeforces,test,permutation,810,Div,include,cases 来源: https://www.cnblogs.com/heystar/p/16533195.html
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