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VECTAR5 - Count Subsets |
You are given a set S = {1, 2, 3, ..., n}. Your task is simple. You have to calculate the number of ways of selecting non empty subsets A and B such that A is not a subset of B and B is not a subset of A. Since answer can be large output the result mod 10^9 + 7.
Input
First line of input contains single integer t denoting number of test cases.
Next t lines contain a single integer n.
Output
For each test case output answer to problem by taking mod with 10^9 + 7.
Constraints
1 <= t <= 100000
1 <= n <= 1000000
Example
SAMPLE INPUT: 2 4 8 SAMPLE OUTPUT: 110 52670
Added by: | Piyush Kumar |
Date: | 2016-06-20 |
Time limit: | 1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 GOSU JS-MONKEY |
hide comments
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2022-01-06 03:04:18
There's a formula to this problem? I only found a DP solution :( Can someone tell me the formula? (Closed formula, of course) |
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2020-01-17 17:06:22
Very nice problem. Took a while to come up with the formula. It turned out to be a simple and elegant one. |
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2016-08-16 12:15:01 ASHUTOSH DWIVEDI
@Piyush i think this is same as hackerearth candy distribution 3 problem it should be mentioned in the resource. Re: I came across this as a math problem somewhere else, so I don't know if I should put it on resource. Last edit: 2016-08-17 12:33:47 |
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2016-07-20 18:56:20
Took a while to get the formula :) |
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2016-06-30 10:05:26 manish kumar
please look at my solution i don't know why i am getting tle Re: Your approach is wrong. Last edit: 2016-06-30 11:29:48 |
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2016-06-26 14:27:18
FInding out solution is easy, watch out for negatives Last edit: 2016-06-26 14:28:51 |
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2016-06-25 15:30:19
Please have a look at my Python solution. Re: You are getting TLE because of the exponentiation without mod. Fix that. Last edit: 2016-06-25 17:39:42 |
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2016-06-23 19:53:05
@Piyush can you check why I'm getting wrong answer because according to me it should be correct Re: You have issues with modular operations. Check for n=113 Last edit: 2016-06-24 12:01:58 |
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2016-06-23 19:05:02 Shubham Dash
@VIpul: Can you explain how the answer came out to be 18 for n=3? |
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2016-06-23 17:16:32 Vipul Srivastava
Is the output 18 for input 3? Re: Yes. Last edit: 2016-06-23 17:48:23 |