简单背包问题——百炼01:Charm Bracelet

点击打开链接http://bailian.openjudge.cn/2016acm/01/

01:Charm Bracelet

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 theN(1 ≤N≤ 3,402) available charms. Each charmiin the supplied list has a weightW_i(1 ≤W_i≤ 400), a 'desirability' factorD_i(1 ≤D_i≤ 100), and can be used at most once. Bessie can only support a charm bracelet whose weight is no more thanM(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.

输入

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

输出

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

样例输入

4 61 42 63 122 7

样例输出

23

代码实现

#include <iostream>#include <cstdio>#include <queue>#include <vector>#include <map>using namespace std;const int maxn = 100000+5;int main(){    int n, m;    int w[maxn], v[maxn];    int dp[maxn];    cin >> n >> m;    for(int i=1; i<=n; i++)        cin >> w[i] >> v[i];    for(int i=1; i<=n; i++)        for(int j=m; j>=w[i]; j--)            dp[j] = max(dp[j] , dp[j-w[i]]+v[i]);    cout << dp[m] <<endl;    return 0;}