[USACO07DEC]手链Charm Bracelet

题目描述

Bessie has gone to the mall's jewelry store and spies a charm bracelet. Of course, she'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. Bessie 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. 有N件物品和一个容量为V的背包。第i件物品的重量是c[i],价值是w[i]。求解将哪些物品装入背包可使这些物品的重量总和不超过背包容量,且价值总和最大。

输入输出格式

输入格式


\* Line 1: Two space-separated integers: N and M \* Lines 2..N+1: Line i+1 describes charm i with two space-separated integers: Wi and Di 第一行:物品个数N和背包大小M 第二行至第N+1行:第i个物品的重量C[i]和价值W[i]

输出格式


\* Line 1: A single integer that is the greatest sum of charm desirabilities that can be achieved given the weight constraints 输出一行最大价值。

输入输出样例

输入样例 #1

4 6
1 4
2 6
3 12
2 7

输出样例 #1

23