hdu4620 Fruit Ninja Extreme

Fruit Ninja Extreme

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 900 Accepted Submission(s): 238
Special Judge

Problem Description

Cut or not to cut, it is a question.
In Fruit Ninja, comprising three or more fruit in one cut gains extra bonuses. This kind of cuts are called bonus cuts.
Also, performing the bonus cuts in a short time are considered continual, iff. when all the bonus cuts are sorted, the time difference between every adjacent cuts is no more than a given period length of W.
As a fruit master, you have predicted the times of potential bonus cuts though the whole game. Now, your task is to determine how to cut the fruits in order to gain the most bonuses, namely, the largest number of continual bonus cuts.
Obviously, each fruit is allowed to cut at most once. i.e. After previous cut, a fruit will be regarded as invisible and won't be cut any more.
In addition, you must cut all the fruit altogether in one potential cut. i.e. If your potential cut contains 6 fruits, 2 of which have been cut previously, the 4 left fruits have to be cut altogether.

 

 

Input

There are multiple test cases.
The first line contains an integer, the number of test cases.
In each test case, there are three integer in the first line: N(N<=30), the number of predicted cuts, M(M<=200), the number of fruits, W(W<=100), the time window.
N lines follows.
In each line, the first integer Ci(Ci<=10) indicates the number of fruits in the i-th cuts.
The second integer Ti(Ti<=2000) indicate the time of this cut. It is guaranteed that every time is unique among all the cuts.
Then follow Ci numbers, ranging from 0 to M-1, representing the identifier of each fruit. If two identifiers in different cuts are the same, it means they represent the same fruit.

 

 

Output

For each test case, the first line contains one integer A, the largest number of continual bonus cuts.
In the second line, there are A integers, K1, K2, ..., K_A, ranging from 1 to N, indicating the (Ki)-th cuts are included in the answer. The integers are in ascending order and each separated by one space. &#160;If there are multiple best solutions, any one is accepted.

 

 

Sample Input

1 4 10 4 3 1 1 2 3 4 3 3 4 6 5 3 7 7 8 9 3 5 9 5 4

 

 

Sample Output

3 1 2 3

 

 

Source

2013 Multi-University Training Contest 2

 

 

Recommend

zhuyuanchen520

水題 ，暴搜，就可以了，一個小小的剪枝，如果，當前得到的分加上，後來一直連切都比得到的結果要小於等於，可以直接剪掉！注意最後，是要排了序再輸出的，這一點，錯了幾次， 儘量不要用 stl因為，這題 時間，卡的緊！

#include <iostream>
#include <stdio.h>
#include <algorithm>
#include <string.h>
using namespace std;
struct node{
    int id,a[15],t,n;
    bool operator <(node b)const{return t<b.t;}
}p[35];
int re[35],tep[35],visit[250],n,w,ans;
bool cmp(node a,node b)
{
    return a<b;
}
bool cmp1(int a,int b){return a<b;}
int dfs(int step,int last,int goal)
{
    int i,sum,j;
    if(goal+n-step<=ans)
    return -1;
    for(i=step+1;i<n;i++)
    {
        if(step!=-1)
        {
            if(p[i].t-p[last].t>w)
            break;
        }
        int prime[20],num;
        for(j=0,sum=0,num=0;j<p[i].n;j++)
        {
            if(!visit[p[i].a[j]])
             visit[p[i].a[j]]=1,prime[num++]=p[i].a[j],sum++;
        }
        if(sum>=3)
        {
            tep[goal+1]=p[i].id;
            dfs(i,i,goal+1);
        }
        else
        {
             if(goal>ans)
            {
            ans=goal;
            for(j=1;j<=goal;j++)
            re[j]=tep[j];
            }
        }
        for(j=0;j<num;j++)
            visit[prime[j]]=0;
    }
    if(goal>ans)
    {
        ans=goal;
        for(j=1;j<=goal;j++)
        re[j]=tep[j];
    }
    return -1;
}
int main()
{
    int tcase,m,i,j;
    scanf("%d",&tcase);
    while(tcase--)
    {
        scanf("%d%d%d",&n,&m,&w);
        memset(visit,0,sizeof(visit));
        for(i=0;i<n;i++)
        {
            scanf("%d%d",&p[i].n,&p[i].t);
            p[i].id=i+1;
            for(j=0;j<p[i].n;j++)
            {
                scanf("%d",&p[i].a[j]);
            }
        }
        sort(p,p+n,cmp);
        ans=0;
        memset(visit,0,sizeof(visit));
        dfs(-1,0,0);
        printf("%d\n",ans);
        sort(re+1,re+ans+1,cmp1);
       for(i=1;i<=ans;i++)
       {
           if(i==1)printf("%d",re[1]);
           else printf(" %d",re[i]);
       }
        if(ans)
        printf("\n");
    }
    return 0;
}