Charm Bracelet（01背包）

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.

#include <iostream>
#include <cstring>
#include <cstdio>
#include <algorithm>
using namespace std;
int dp[40000], w[40000], v[40000];
int n, t, m;
int main()
{
    while (cin >> n >> m) {
        memset(dp,0,sizeof(dp));
        for (int i = 1; i <=n; i++) {
            cin >> v[i] >> w[i];
        }
        for (int i = 1; i <=n; i++)
            for (int j = m; j >= v[i]; j--)
                dp[j] = max(dp[j], dp[j - v[i]] + w[i]);
            cout<<dp[m]<<endl;
    }
    return 0;
}