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.
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 32-bit integer.
- "END" - Indicates the end of the test case.
For each test case, output one line for the answer to each "SUM" command. Print a blank line after each test case.
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
Learned:- never use endl :)
things to keep in mind
Iterative 2D segment tree passed without problems.
No matter how much optimisation is done, 2-D segment tree isn't working. Time Limit is too strict for it.
getting tle after using int ,scanf,printf,fastio,BIT , plz someone help
Things to look out for:
.Last edit: 2021-01-27 19:27:54
Its giving TLE in JAVA using 2D segment tree. Doesn't SPOJ provide extra time for slow languages like JAVA?
use scanf & printf instead :), if u got TLE in spite of your right algorithm
Isn't it really possible to get AC using Segment tree in CPP? Is there anybody? Please share what you have done?