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YAPP - Yet Another Permutations Problem |
How many permutations of the first N numbers exist such that the maximum element between the indices [i..j] is either present at index i, or at index j ?
Input
The first line contains the number of test cases T. Each of the next T lines contains an integer N
Output
Output T lines containing the required answer for the corresponding test case. Since the answers can get really big, output the result modulo 1000000007.
Example
Sample Input: 1 2 Sample Output: 2
Constraints
1 <= T <= 10000
1 <= N <= 1000000000
Added by: | Varun Jalan |
Date: | 2010-01-25 |
Time limit: | 1.690s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: NODEJS OBJC PERL6 SQLITE VB.NET |
Resource: | own problem used for Technovanza |
hide comments
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2018-06-16 21:54:00
Use modular exponentiation. |
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2016-11-30 23:00:38 paras meena
@[bitthal] N >= 1 |
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2016-06-20 20:34:00 KD
AC in one go :D my 200th :) |
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2016-06-02 19:21:16 Arpit Gupta
Anyone Help... used exponentiation... used ans=1 for n=0 and 1, tests where my code might go wrong ans for n=10 is 512... i got that... EDIT: Did a silly mistake in precompuation :D Last edit: 2016-06-02 19:48:33 |
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2016-06-02 19:18:51 Arpit Gupta
Some sample tests where my program goes wrong... used exponentiation.... for n=0,1 ans=1 also.. even then wrong ans... Help anyone?? |
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2015-12-13 16:05:13 cegprakash
For those who feel the problem statement is not clear, you have to find the number of permutations such that for all i,j 1<=i<=j<=n the maximum element between the indices [i..j] is either present at index i, or at index j Last edit: 2015-12-13 19:28:16 |
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2015-06-20 12:47:21 prateek goyal
no need of permutation and combination |
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2014-08-17 18:22:55 [bitthal]
for n=0...ans is 1. simple maths but test case 0 can costs a lot.. Last edit: 2014-08-17 18:23:52 |
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2014-06-30 13:34:41 L
if getting TLE use modular arithmetic.. for n=10 ans is 512 . easy when you understand the question.. Last edit: 2014-06-30 13:35:57 |
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2014-05-29 16:53:55 appy
More test cases pls |