Description

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 W_i (1 ≤ W_i ≤ 400), a 'desirability' factor D_i (1 ≤ D_i ≤ 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.

Input

* Line 1: Two space-separated integers: N and M

* Lines 2..N+1: Line i+1 describes charm i with two space-separated integers: W_i and D_i

Output

* Line 1: A single integer that is the greatest sum of charm desirabilities that can be achieved given the weight constraints

Sample Input

4 61 42 63 122 7

Sample Output

23

思路

简单01背包进行套用模板即可: for i=1…..N   for v=V….0       f[v]=max(f[v], f[v-c[i]]+w[i];

源码

#include<stdio.h> #include<string.h> #include<iostream> using namespace std; int main() {        int w[3500], d[3500], m, n, i, bag[15000], j;        while(scanf("%d%d", &n, &m)!=EOF)        {               memset(bag, 0, sizeof(bag));               for(i=1; i<=n; i++)                      scanf("%d%d", &w[i], &d[i]);               for(i=1; i<=n; i++)                      for(j=m; j>=w[i]; j--)                      {                                    bag[j]=max(bag[j], bag[j-w[i]]+d[i]);                      }               printf("%d\n", bag[m]);        } }