poj 1276 多重背包

735 3  4 125  6 5  3 350　　　　//735的最大额，3种，4个125,6个5,3个350
633 4  500 30  6 100  1 5  0 1
735 0
0 3  10 100  10 50  10 10

735
630
0
0

 #include<cstdio>
 #include<iostream>
 #include<algorithm>
 #include<cstring>
 #include<cmath>
 #include<queue>
 using namespace std;
 const int maxn=;
 int n,m,t;
 int dp[maxn],w[maxn],v[maxn];
 int nValue;
 //0-1背包，代价为cost,获得的价值为weight
 void ZeroOnePack(int cost,int weight)
 {
     for(int i=nValue;i>=cost;i--)
       dp[i]=max(dp[i],dp[i-cost]+weight);
 }

 //完全背包，代价为cost,获得的价值为weight
 void CompletePack(int cost,int weight)
 {
     for(int i=cost;i<=nValue;i++)
       dp[i]=max(dp[i],dp[i-cost]+weight);
 }

 //多重背包
 void MultiplePack(int cost,int weight,int amount)
 {
     if(cost*amount>=nValue) CompletePack(cost,weight);
     else
     {
         int k=;
         while(k<amount)
         {
             ZeroOnePack(k*cost,k*weight);
             amount-=k;
             k<<=;
         }
         ZeroOnePack(amount*cost,amount*weight);//这个不要忘记了，经常掉了
     }
 }
 int main()
 {
     int i,j,k;
     #ifndef ONLINE_JUDGE
     freopen("1.in","r",stdin);
     #endif
     while(scanf("%d%d",&nValue,&n)!=EOF)
     {
         for(i=;i<n;i++)
         {
             scanf("%d%d",&w[i],&v[i]);
         }
         memset(dp,,sizeof(dp));
         for(i=;i<n;i++)
         {
             MultiplePack(v[i],v[i],w[i]);
         }
         printf("%d\n",dp[nValue]);
     }
 }