142 人解决，186 人已尝试。
176 份提交通过，共有 521 份提交。
3.1 EMB 奖励。
单点时限: 2.0 sec
内存限制: 256 MB
Partychen has gone to the mall’s jewelry store and spies a charm bracelet. Of course, he’d like to fill it with the best charms possible from the N (1 ≤ N ≤ 3,402) available charms. Each charm i in the supplied list has a weight Wi (1 ≤ Wi ≤ 400), a ‘desirability’ factor Di (1 ≤ Di ≤ 100), and can be used at most once. partychen can only support a charm bracelet whose weight is no more than M (1 ≤ M ≤ 12,880).
Given that weight limit as a constraint and a list of the charms with their weights and desirability rating, deduce the maximum possible sum of ratings.
The first line are two space-separated integers: N and M
The next N lines describes charm i with two space-separated integers: Wi and Di
A single integer that is the greatest sum of charm desirabilities that can be achieved given the weight constraints
4 6 1 4 2 6 3 12 2 7
23 Hint: We choose 1 4,2 7,3 12,we can get the greatest sum 23.and the weight is 6.