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  • POJ 3624 Charm Bracelet【01背包】

    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 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.

    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: Wi and Di

    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 6
    1 4
    2 6
    3 12
    2 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]);

           }

    }

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  • 原文地址:https://www.cnblogs.com/Hilda/p/2616900.html
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