poj 3260 最少硬币（01+多重+完全背包）

Posted 2020-08-02 qlky

http://www.cnblogs.com/ACMan/archive/2012/08/14/2637437.html

 

#include <iostream>
#include <string>
#include <cstring>
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <stack>
#include <queue>
#include <cctype>
#include <vector>
#include <iterator>
#include <set>
#include <map>
#include <sstream>
using namespace std;

#define mem(a,b) memset(a,b,sizeof(a))
#define pf printf
#define sf scanf
#define spf sprintf
#define pb push_back
#define debug printf("!\\n")
#define MAXN 1010
#define MAX(a,b) a>b?a:b
#define blank pf("\\n")
#define LL long long
#define ALL(x) x.begin(),x.end()
#define INS(x) inserter(x,x.begin())
#define pqueue priority_queue
#define INF 0x3f3f3f3f

int n,T;

const int mx = 30000;

int dp[30000],f[30000],w[30000],c[30000];


void zobag(int value,int weight)
{
    for(int v = mx;v>=weight;v--)
    {
        dp[v] = min(dp[v],dp[v-weight]+value);
    }
}

void cmbag(int value,int weight)
{
    for(int v = weight;v<=mx;v++)
    {
        dp[v] = min(dp[v],dp[v-weight]+value);
    }
}

void fcmbag(int value,int weight)
{
    for(int v = weight;v<=mx;v++)
    {
        f[v] = min(f[v],f[v-weight]+value);
        //pf("v%d f%d\\n",v,f[v]);
    }
}

void mubag(int weight,int amount)
{
    if(weight*amount >= mx)
    {
        cmbag(1,weight);
        return;
    }
    int k = 1;
    while(k < amount)
    {
        //pf("amt%d\\n",amount);
        //pf("k%d\\n",k);
        zobag(k,k*weight);
        amount-=k;
        k*=2;
    }
    zobag(amount,amount*weight);
}

int main()
{
    int i,j;
    while(~sf("%d%d",&n,&T))
    {
        mem(dp,INF);
        mem(f,INF);
        dp[0]=0;
        for(i=0;i<n;i++)
        {
            sf("%d",&w[i]);
        }
        for(i=0;i<n;i++)
        {
            sf("%d",&c[i]);
        }
        for(i=0;i<n;i++)
        {
            mubag(w[i],c[i]);
        }
        f[0]=0;
        for(i=0;i<n;i++)
        {
            fcmbag(1,w[i]);
        }
        int ans = INF;
        for(i=0;i<mx-T;i++)
        {
            ans = min(ans,dp[i+T]+f[i]);
        }
        if(ans == INF) ans = -1;
        pf("%d\\n",ans);
    }
    return 0;
}