## hdu5188 加限制的01背包问题

2019年05月18日 ⁄ 综合 ⁄ 共 3315字 ⁄ 字号 评论关闭

http://acm.hdu.edu.cn/showproblem.php?pid=5188

Problem Description
As one of the most powerful brushes in the world, zhx usually takes part in all kinds of contests.
One day, zhx takes part in an contest. He found the contest very easy for him.
There are n problems
in the contest. He knows that he can solve the ith problem
in ti units
of time and he can get vi points.
As he is too powerful, the administrator is watching him. If he finishes the ith problem
before time li,
he will be considered to cheat.
zhx doesn't really want to solve all these boring problems. He only wants to get no less than w points.
You are supposed to tell him the minimal time he needs to spend while not being considered to cheat, or he is not able to get enough points.
Note that zhx can solve only one problem at the same time. And if he starts, he would keep working on it until it is solved. And then he submits his code in no time.

Input
Multiply test cases(less than 50).
Seek EOF as
the end of the file.
For each test, there are two integers n and w separated
by a space. (1n300w109)
Then come n lines which contain three integers ti,vi,li.
(1ti,li105,1vi109)

Output
For each test case, output a single line indicating the answer. If zhx is able to get enough points, output the minimal time it takes. Otherwise, output a single line saying "zhx is naive!" (Do not output quotation marks).

Sample Input
1 3
1 4 7
3 6
4 1 8
6 8 10
1 5 2
2 7
10 4 1
10 2 3

Sample Output
7
8
zhx is naive!
/**
hdu5188 有限制条件的01背包问题

问得到w分的最小用时是多少

就行了
*/
#include <stdio.h>
#include <string.h>
#include <algorithm>
#include <iostream>
using namespace std;

struct note
{
int t,v,l;
bool operator <(const note &other)const
{
return l-t<other.l-other.t;
}

}node[35];

int n,m;
int dp[3000005];

int main()
{
while(~scanf("%d%d",&n,&m))
{
int sum=0,ans=0,up=0;
for(int i=0;i<n;i++)
{
scanf("%d%d%d",&node[i].t,&node[i].v,&node[i].l);
sum+=node[i].v;
ans+=node[i].t;
up=max(up,node[i].l);
}
if(m>sum)
{
printf("zhx is naive!\n");
continue;
}
sort(node,node+n);
up=max(up,ans);
memset(dp,0,sizeof(dp));
for(int i=0;i<n;i++)
{
for(int j=up;j>=node[i].l;j--)
{
if(j>=node[i].t)
{
dp[j]=max(dp[j],dp[j-node[i].t]+node[i].v);
}
}
}
int flag=0;
for(int i=0;i<=up;i++)
{
if(dp[i]>=m)
{
printf("%d\n",i);
flag=1;
break;
}
}
if(flag==0)
{
printf("zhx is naive!\n");
}
}
return 0;
}


Problem Description
As one of the most powerful brushes in the world, zhx usually takes part in all kinds of contests.
One day, zhx takes part in an contest. He found the contest very easy for him.
There are n problems
in the contest. He knows that he can solve the ith problem
in ti units
of time and he can get vi points.
As he is too powerful, the administrator is watching him. If he finishes the ith problem
before time li,
he will be considered to cheat.
zhx doesn't really want to solve all these boring problems. He only wants to get no less than w points.
You are supposed to tell him the minimal time he needs to spend while not being considered to cheat, or he is not able to get enough points.
Note that zhx can solve only one problem at the same time. And if he starts, he would keep working on it until it is solved. And then he submits his code in no time.

Input
Multiply test cases(less than 50).
Seek EOF as
the end of the file.
For each test, there are two integers n and w separated
by a space. (1n300w109)
Then come n lines which contain three integers ti,vi,li.
(1ti,li105,1vi109)

Output
For each test case, output a single line indicating the answer. If zhx is able to get enough points, output the minimal time it takes. Otherwise, output a single line saying "zhx is naive!" (Do not output quotation marks).

Sample Input
1 3
1 4 7
3 6
4 1 8
6 8 10
1 5 2
2 7
10 4 1
10 2 3

Sample Output
7
8
zhx is naive!