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SUMPRO - SUM OF PRODUCT |
Given a number N, find the sum of all products x * y such that N / x = y (integer division).
Since the sum can be very large, please output this modulo 1000000007.
Input
The first line of input file contains an integer T, the number of test cases to follow. Each of the next T lines contain an integer N.
Output
Output T lines containing the answer to corresponding test case.
Example
Input: 3 2 4 6 Output: 4 15 33
Constraints:
1 ≤ T ≤ 500
1 ≤ N ≤ 109
Explanation
Case #1:
2 / 1 = 2
2 / 2 = 1
Answer = 1 * 2 + 2 * 1 = 4
Case #2:
4 / 1 = 4
4 / 2 = 2
4 / 3 = 1
4 / 4 = 1
Answer = 1 * 4 + 2 * 2 + 3 * 1 + 4 * 1 = 15
Added by: | ivar.raknahs |
Date: | 2015-01-23 |
Time limit: | 1s-1.5s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All |
Resource: | Own |
hide comments
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2015-05-25 21:52:08 Vaporeon
Awesome Maths here!! loved it! :D :* D: |
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2015-05-19 06:30:01 Amitayush Thakur
Think of O(n) solution first and then think of O(sqrt(n)) . Directly jumping over the O(sqrt(n)) solution will not help. |
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2015-04-14 10:34:25 Szymon
my solution works perfect for all numbers ... instead of {3,8,15,24} ;) I cheated lil bit and got AC, but don't want to investigate why it doesn't handle those 4 inputs |
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2015-04-12 18:24:08 rafiki93
@ivar.raknahs, I can't seem to login to the forum, hence posting my question here. Can you check my code, submission id: 14081284, and let me know which corner case my code doesn't handle. All test cases openly available passed. please help a little. Last edit: 2015-04-12 19:32:34 |
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2015-02-20 05:01:41 Juan Carlos Arocha
akshaych dividing unsigned integers is faster than dividing signed integers (http://en.wikibooks.org/wiki/Optimizing_C%2B%2B/Code_optimization/Faster_operations#Integer_division_by_a_constant) reply-> thanks for sharing the information. Last edit: 2015-02-24 03:47:14 |
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2015-02-19 20:53:03 akshaych
long long -> TLE long long unsigned -> AC..,Don't know why..!! However,it ruined my day..!! :( :( |
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2015-02-02 17:45:44 rishu
ivar.raknahs i got AC. but i am not satisfied with my solution. as there are many better solution. Just curious to know .. is there any better algo which can find in less than O(sqrt(n)). (Francky) ⇒ Mine is O(sqrt(n)) too, but I use div, mod and sqrt as few as possible. Last edit: 2015-02-02 17:55:44 |
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2015-02-01 21:17:04 sahil hindwani
can u pls tell me the ans for 10^9 re(vamsi): my AC solution outputs 355091432 Last edit: 2015-02-03 08:05:33 |
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2015-01-31 12:33:59 Raj Kumar Chauhan
anyone help me, why TLE? [Link removed] re(vamsi): don't post your code here(use forum) you obviously need a better algorithm than that Last edit: 2015-01-31 13:04:20 |
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2015-01-26 13:43:03 :?ToRpiDo
@ivar.raknahs some tricky cases...plz --reply--> sorry ,no more test cases will be provided. Last edit: 2015-01-27 05:36:00 |