DCEPC206  Its a Murder!
Once detective Saikat was solving a murder case. While going to the crime scene he took the stairs and saw that a number is written on every stair. He found it suspicious and decides to remember all the numbers that he has seen till now. While remembering the numbers he found that he can find some pattern in those numbers. So he decides that for each number on the stairs he will note down the sum of all the numbers previously seen on the stairs which are smaller than the present number. Calculate the sum of all the numbers written on his notes diary.
Input
First line gives T, number of test cases.
2T lines follow.
First line gives you the number of stairs N
Next line gives you N numbers written on the stairs.
Output
For each test case output one line giving the final sum for each test case.
Constraints
T<=10
1<=N<=10^5
All numbers will be between 0 and 10^6.
Example
Input: 1
5
1 5 3 6 4
Output: 15
Added by:  dce coders 
Date:  20120226 
Time limit:  1.259s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel Pentium G860 3GHz) 
Languages:  All 
Resource:  Own Problem 
hide comments
SangKuan:
20150810 13:19:08
ac by mergesort . to many tle with common lisp,optimize after optimize,finally got ac.haha,no need to rewrite by c 

rk:
20150628 16:22:26
plz dont forget the zero case and declare array long long &finally done :)


r0bo_dart:
20150625 09:31:40
Hint: one version of merge sort will fail coz we want to include m < n not m <= n.... 

Aditya Kumar:
20150624 10:12:30
Better solve inversion count first!! 

Baymax:
20150527 22:59:11
did it with mergesort


i_am_looser:
20150524 09:45:41
Good question =) 

Madhav:
20150402 11:40:28
good question!! 

abhijeet gusain:
20150219 21:10:30
@Gaurav necessary test cases are already given ... it may be that ur code has some input issues ... 

Gaurav sharma:
20141228 05:39:28
I'm getting wrong ans... plz give me d special test case.. 

vivek:
20141206 19:06:46
After one TLE accepted B 