1299  Baijingyuan’s celebration
Time Limit : 5 Second
Memory Limit : 128 MB
Submission: 176
Solved: 41
 Description
To celebrate the 8th anniversary of establishment of Baijingyuan Dining Hall, The HUST Logistic Services prepare a large number of point ticket repayment teachers and students. As a fans of Baijingyuan, Gaewah of course won’t miss the chance.
Each point ticket has a point and a value. For every user, if this is the ith ticket you get, the ticket will be add a serial number i.
Then if you collect some continuous serial number tickets, and the sum of the ticket’s point is equal or more than M, you can get the maximum value of these tickets’ value.
Gaewah collect N tickets numbered 1,2,……,N. He want to know the maximum total value he can get. Input
 The first line you can get a number t indicate the number of test case.
For each test case:
The first line have 2 integers N and M indicate the number of ticket Gaewah collect and the minimum point M to exchange the value.(1<=N,M<=50000)
Then N lines. Each line has 2 integers indicate the ith tickets’ point and value.(point and value will ranged in [0..2^311])  Output
 For each case just output a integer indicate the maximum value Gaewah can get.
 sample input

1 4 4 1 5 2 4 1 6 10 10
 sample output

16
 hint
 source
 Hust Monthly 09.08.21/Zehua HONG