RANGESUM - Range Sum
You are initially given an array of N integers ( 1<=N<=105 ). Given this array, you have to perform 2 kinds of operations :
(i) Operation 1 : Op1( l, r )
You are given 2 integers l and r. ( 1 <= l <= r <= current size of the array ). You need to return the sum of all the elements with indices between l and r ( both inclusive ). That is, if the elements currently in the array are a1, a2, a3.... an, you need to return the following sum : al + al+1 + al+2 ... + ar.
(ii) Operation 2 : Op2( x )
You are given a single integer x ( |x| <= 109 ). Add this element to the beginning of the array. After this operation, x will now become a1, the old a1 will now become a2, and so on. The size of the array will increase by 1.
Input
The first line contains a single integer N ( 1 <= N <= 105 ), the number of elements initially in the array.
This is followed by a line containing N space separated integers, a1 a2 .... aN. ( |ai| <= 109 )
The next line contains a single integer Q, the number of operations you will be asked to perform. ( 1 <= Q <= 105 )
Q lines of input follow. Each such line starts with either the number 1 or the number 2. This indicates the type of operation that you are required to perform. The format of these queries are as follows :
1 l r : Carry out operation 1 with arguments l and r. ( 1 <= l <= r <= current size of the array )
That is, return the sum of the following array elements : al + al+1 ... + ar
2 x : Carry out operation 2 with the argument x. ( |x| <= 109 )
That is, add the value x at the beginning of the array.
Output
For each query of type 1, output the return value on a new line. No output needs to be printed for queries of type 2.
Example
Input #1: 10
1 2 3 4 5 6 7 8 9 10
4
1 1 10
1 1 1
1 10 10
1 2 7
Output #1:
55
1
10
27
Input #2:
5
6 7 8 9 10
9
2 5
2 4
1 2 7
2 3
2 2
2 1
1 1 10
1 1 1
1 10 10
Output #2:
45
55
1
10
hide comments
naruto09:
2016-03-28 05:27:15
awesome problem..learned something new..;) |
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Divyaanand Sinha:
2016-01-07 13:46:18
Is the array sorted? |
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baranowski:
2016-01-06 13:33:28
This is driving me crazy... Nice O(n+q) solution in C++, and I'm getting TLE around test case #5. |
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hodobox:
2015-12-03 20:49:39
Nice problem :) can be done with O(1) for both querries, and then you can just take the reversed array from input and process it all as type 2 querry :P |
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dwij28:
2015-08-29 16:40:21
O(1) for all queries. AC. A few months back I would have never solved this question. Time helps us evolve and get better .. :) Last edit: 2016-10-07 09:30:22 |
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kumar saurav sinha:
2015-06-24 16:54:52
AC in first attempt :D........ good question though....... |
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Abhilash:
2015-06-23 12:49:34
easy |
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pingal tirkey:
2015-05-23 18:33:22
Be careful I assumed numbers in array to be positive which caused me 6 WA!
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:.Mohib.::
2014-12-25 20:46:34
AC in first attempt.... :) |
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saanc:
2014-11-04 05:25:57
some test files have q>100000.Problem setter should not do this |
Added by: | Gowri Sundaram |
Date: | 2013-04-11 |
Time limit: | 2s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 |