POLYMUL  Polynomial Multiplication
Sam and Dean fight the supernatural creatures to protect the humans. Now they have come across a creature called the Vedala, which are always found in pairs. Each vedala can be represented by a polynomial. Both the Vedalas need to be killed at once or else they can't be killed. They can be killed only by using the product of the two polynomials representing the two Vedala. Help Sam and Dean find the product of the polynomials fast, so they can do thier work.
Input
First line contains an integer T (≤ 10), number of test cases.
Each test case will have n (n ≤ 10000), maximum degree of the polynomials on the first line.
Next two lines will have n+1 space separated integers each representing the coeffiecients of first and second polynomials respectively.
All input coefficients values are <=1000.
Output
For each test case ouput a line of 2n space seperated integers indicating coefficients of the polynomial created after multiplication.
Example
Input: 2 2 1 2 3 3 2 1 2 1 0 1 2 1 0 Output: 3 8 14 8 3 2 1 2 1 0
Explaination
1st test case n=2, the polynomials are x^2 + 2x + 3 and 3x^2 + 2x + 1.
On multiplying we get 3x^4 + 8x^3 + 14x^2 + 8x + 3 and hence the answer is 3 8 14 8 3.
2nd test case n=2, the polynomials are x^2 + 1 and 2x^2 + x.
On multiplying we get 2x^4 + x^3 + 2x^2 + x and hence the answer is 2 1 2 1 0.
hide comments
ankit_mnnit:
20181029 18:55:02
Use long long in place of int for coefficients it causes me 1 WA 

rd10:
20181021 13:42:05
Accepted with plain brute algo with O(n^2) time also. 

mohinem:
20171125 10:50:54
Requires FFT.


weramajstor:
20170812 17:36:02
I'm kind of dissapointed...Before trying to write my first Karatsuba,I tested if this problem would pass with using optimised(fast input) O(n^2) algorithm in C++ and it turns out it does pass...Well atleast you can compare your Karatsuba/FFT time with your O(N^2) algorithm.Constraints should have been 10^5 and then it would be fun Last edit: 20170812 17:37:35 

galloska:
20161101 05:03:28
Just FYI: You have to print 2*n + 1 values. 

Mateus Gonçalves de Oliveira [ITA]:
20151014 04:15:57
Be careful with the limits. The coefficients might not fit in a 32bit integer. 

Eddy Cael:
20150817 04:57:41
Easy with fft. 

prateek goyal:
20150616 14:02:16
@Abhra output contain 2n integers or 2n+1 integers ??


Muhammad Rifayat Samee (Sanzee):
20150530 19:55:19
getting WA....Need some test cases...


mkrjn99:
20150305 10:26:26
Took 3 days to get AC, but totally worth it! 
Added by:  Abhra 
Date:  20140212 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ASM64 