RRANGE - Ranges
There are N contiguous cells numbered from 1 to N. Initially, each cell contains a 0 in it. A sub-contiguous group of cells can be updated this way:
1) A range [i,j] is defined such that i < j
2) The cell numbered i is added 1; the cell numbered i + 1 is added 2, and so on until the cell numbered j is reached and added j – i + 1
For example, if N = 7 and the updates [3, 6] and [4,7] were performed, this is what would happen.
Initially: {0,0,0,0,0,0,0}
Update [3,6]: {0,0,1,2,3,4,0}
Update [4,7]: {0,0,1,3,5,7,4}
After performing some update operations, it would be amazing to answer questions like the following:
1) A range [u,v] is defined such that u < v
2) The answer is the sum of every cell in the range [u,v] (both u and v are included) modulus 10,000
Given N and U updates ranges. You have to write a program capable of answering Q questions.
Input
The first line contains three integers: N (1 <= N <= 1,000,000,000), U and Q (1 <= U, Q <= 1,000), representing the number of cells, the number of update operations, and the number of questions respectively.
Each of the following U lines contains two integers i and j (1 <= i < j <= N) separated by a single space indicating an update operation.
Each of the following Q lines contains two integers u and v (1 <= u < v <= N) separated by a single space indicating a question.
Output
For each question [u,v] you must print the sum of all contiguous cells starting at u and ending at v modulus 10,000.
Example
Input: 7 2 2 3 6 4 7 4 6 1 7 Output: 15 20
hide comments
fanatique:
2014-06-15 09:58:28
can't we solve using BIT? |
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aristofanis:
2014-06-14 17:41:33
@npsabari: It can be solved with segment tree with complexity O((U+Q) log N), although
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npsabari:
2014-01-28 10:14:43
Did anyone manage to solve it in complexity better than O(U*Q)? |
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rahul kumar:
2013-12-17 21:39:44
nice problem...:P |
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Vikas Kushwaha:
2013-01-18 06:57:28
Such a nice question..
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Ehor Nechiporenko:
2012-12-25 09:48:13
So NICE!! |
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DaRksTar:
2012-07-05 10:54:14
weird !!
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Romal Thoppilan:
2012-07-05 07:14:46
Tough time debugging .. !
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Angel Paredes:
2012-02-20 03:58:40
Both updates and questions are defined by two integers between 1 and N, so the test case you are asking for is incorrect.
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Added by: | Angel Paredes |
Date: | 2012-02-13 |
Time limit: | 1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 |
Resource: | Copa Lenin 2012 - Level 1 |