MATSUM  Matrix Summation
A N × N matrix is filled with numbers. BuggyD is analyzing the matrix, and he wants the sum of certain submatrices every now and then, so he wants a system where he can get his results from a query. Also, the matrix is dynamic, and the value of any cell can be changed with a command in such a system.
Assume that initially, all the cells of the matrix are filled with 0. Design such a system for BuggyD. Read the input format for further details.
Input
The first line of the input contains an integer t, the number of test cases. t test cases follow.
The first line of each test case contains a single integer N (1 <= N <= 1024), denoting the size of the matrix.
A list of commands follows, which will be in one of the following three formats (quotes are for clarity):
 "SET x y num"  Set the value at cell (x, y) to num (0 <= x, y < N).
 "SUM x1 y1 x2 y2"  Find and print the sum of the values in the rectangle from (x1, y1) to (x2, y2), inclusive. You may assume that x1 <= x2 and y1 <= y2, and that the result will fit in a signed 32bit integer.
 "END"  Indicates the end of the test case.
Output
For each test case, output one line for the answer to each "SUM" command. Print a blank line after each test case.
Example
Input: 1 4 SET 0 0 1 SUM 0 0 3 3 SET 2 2 12 SUM 2 2 2 2 SUM 2 2 3 3 SUM 0 0 2 2 END Output: 1 12 12 13
hide comments
mahbubkuet08:
20190315 18:40:47
Isn't it really possible to get AC using Segment tree in CPP? Is there anybody? Please share what you have done? 

saurabhs_1206:
20190122 19:13:53
in java, it is giving TLE using 2D BIT...please suggest what to do 

Erick:
20190105 11:05:45
Don't worry using int, every op in the problem fits in it. 

tien0903:
20181210 15:39:21
musn't use long if u want 2 AC :D use scanf and prinf is much faster 

imkiller:
20180607 17:00:00
1 hour But Finally Solved


flyingduchman_:
20170920 21:46:30
A nice 2D BIT problem, int works 

sonu:
20170620 17:43:54
Easy one if you Know 2d bit 

joseluisacv2:
20170603 04:41:10
It can be solved with 2D Segment Tree 

cake_is_a_lie:
20170228 17:24:28
cin/cout (optimized to avoid flushes); bit2d<int> 0.30s; bit2d<long long> 0.33s


rraj001:
20161211 10:32:38
Nice problem to learn 2D BIT

Added by:  Matthew Reeder 
Date:  20061029 
Time limit:  1.029s 
Source limit:  30000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ERL JSRHINO NODEJS PERL6 VB.NET 
Resource:  AlKhawarizm 2006 