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KOPC12B - K12-Combinations |
Given n find the value of ((nC1)2+2*(nC2)2+3*(nC3)2+4*(nC4)2+ ... +n*(nCn)2)% MOD, where MOD=10^9+7.
Note: nCr is the number of ways of choosing r items from n items.
Input
The first line of input file contains T which denotes number of test cases. Each of the following line contains an integer n. T<=1000 and n<=10^6.
Output
The output must contain T lines each line corresponding to a testcase.
Example
Input: 2 1 2 Output: 1 6
Added by: | Radhakrishnan Venkataramani |
Date: | 2012-01-31 |
Time limit: | 1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 |
hide comments
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2014-10-24 19:45:30 mandu_ism
Beware of unnecessary precomputations! cost me a lot of TLEs. |
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2013-06-05 09:25:47 vikas sharma
Finally AC.... was doing a silly mistake...:) |
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2013-05-14 18:30:11 [Lakshman]
Good one...Finally AC.... |
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2013-05-12 03:41:15 Ouditchya Sinha
Finally AC! Awesome problem. High School Maths... :) |
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2013-04-20 20:25:30 Arpit Mittal
strangely getting nzec error |
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2012-02-07 18:43:14 varshini
getting TLE..!!! |