Time Limit: 3000/2000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others)
Total Submission(s): 1243 Accepted Submission(s): 368
/*
hdu 5445 多重背包
problem:
给一场运动会提供食物,每种食物提供ti能量,占用vi空间,最多可提供ui个,把食物运到指定地点,每种车可以运送ai体积的
食物,消耗bi的金钱,总共有ci个这种车,问给运动会提供至少p的能量,最少需要花多少运费
(每个食物可以拆开来运)
solve:
可以将其分成两个多重背包计算,先计算出运送指定能量的食物最少需要多少的空间,然后在这个空间的基础上计算最少需要
的花费.结果RE,后来发现这个空间可能很大.
而题目中说了50000这个界限,所以直接计算出50000的花费能够达到的最大空间
hhh-2016-08-17 15:13:15
*/
#include <algorithm>
#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <vector>
#include <map>
#define lson i<<1
#define rson i<<1|1
#define ll long long
#define key_val ch[ch[root][1]][0]
using namespace std;
const int maxn = 1010;
const int inf = 0x3f3f3f3f;
int dp[51000];
int ta,a,c;
void cal_min(int cost,int val,int num,int m)
{
if(cost * num >= m)
{
for(int i = cost; i <= m; i++)
{
dp[i] = min(dp[i],dp[i-cost] + val);
}
}
else
{
int k = 1;
while(k < num)
{
for(int i = m; i >= cost*k; i--)
dp[i] = min(dp[i],dp[i-cost*k]+val*k);
num -= k;
k *= 2;
}
for(int i = m; i >= cost*num; i--)
dp[i] = min(dp[i],dp[i-cost*num]+val*num);
}
}
void cal_max(int cost,int val,int num,int m)
{
if(cost * num >= m)
{
for(int i = cost; i <= m; i++)
{
dp[i] = max(dp[i],dp[i-cost] + val);
}
}
else
{
int k = 1;
while(k < num)
{
for(int i = m; i >= cost*k; i--)
dp[i] = max(dp[i],dp[i-cost*k]+val*k);
num -= k;
k *= 2;
}
for(int i = m; i >= cost*num; i--)
dp[i] = max(dp[i],dp[i-cost*num]+val*num);
}
}
int main()
{
// freopen("in.txt","r",stdin);
int n,m,cnt;
int T;
cin >> T;
while(T--)
{
memset(dp,inf,sizeof(dp));
dp[0] = 0;
scanf("%d%d%d",&n,&cnt,&m);
for(int i = 1; i <= n; i++)
{
scanf("%d%d%d",&a,&c,&ta);
cal_min(a,c,ta,m + 100); //因为每个能量最多100,所以最大界限为m+100
}
int minpart = inf;
for(int i = m; i <= m+100; i++)
{
minpart = min(minpart,dp[i]);
}
// cout <<"m:" <<m <<" min:"<<minpart <<endl;
memset(dp,0,sizeof(dp));
for(int i = 1; i <= cnt; i++)
{
scanf("%d%d%d",&a,&c,&ta);
cal_max(c,a,ta,50000+100);
}
int ans = inf;
for(int i = 0;i <= 50000;i++){
if(dp[i] >= minpart)
{
ans = i;
break;
}
}
if(ans == inf)
printf("TAT\n");
else
printf("%d\n",ans);
}
return 0;
}
原文:http://www.cnblogs.com/Przz/p/5792161.html