hdu 1342（DFS)

Lotto

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 2933    Accepted Submission(s): 1386

Problem Description

In
a Lotto I have ever played, one has to select 6 numbers from the set
{1,2,...,49}. A popular strategy to play Lotto - although it doesn't
increase your chance of winning - is to select a subset S containing k
(k>6) of these 49 numbers, and then play several games with choosing
numbers only from S. For example, for k=8 and S = {1,2,3,5,8,13,21,34}
there are 28 possible games: [1,2,3,5,8,13], [1,2,3,5,8,21],
[1,2,3,5,8,34], [1,2,3,5,13,21], ... [3,5,8,13,21,34].
Your job
is to write a program that reads in the number k and the set S and then
prints all possible games choosing numbers only from S.

Input

The
input file will contain one or more test cases. Each test case consists
of one line containing several integers separated from each other by
spaces. The first integer on the line will be the number k (6 < k
< 13). Then k integers, specifying the set S, will follow in
ascending order. Input will be terminated by a value of zero (0) for k.

Output

For
each test case, print all possible games, each game on one line. The
numbers of each game have to be sorted in ascending order and separated
from each other by exactly one space. The games themselves have to be
sorted lexicographically, that means sorted by the lowest number first,
then by the second lowest and so on, as demonstrated in the sample
output below. The test cases have to be separated from each other by
exactly one blank line. Do not put a blank line after the last test
case.

Sample Input

7 1 2 3 4 5 6 7

8 1 2 3 5 8 13 21 34

0

Sample Output

1 2 3 4 5 6

1 2 3 4 5 7

1 2 3 4 6 7

1 2 3 5 6 7

1 2 4 5 6 7

1 3 4 5 6 7

2 3 4 5 6 7

 

1 2 3 5 8 13

1 2 3 5 8 21

1 2 3 5 8 34

1 2 3 5 13 21

1 2 3 5 13 34

1 2 3 5 21 34

1 2 3 8 13 21

1 2 3 8 13 34

1 2 3 8 21 34

1 2 3 13 21 34

1 2 5 8 13 21

1 2 5 8 13 34

1 2 5 8 21 34

1 2 5 13 21 34

1 2 8 13 21 34

1 3 5 8 13 21

1 3 5 8 13 34

1 3 5 8 21 34

1 3 5 13 21 34

1 3 8 13 21 34

1 5 8 13 21 34

2 3 5 8 13 21

2 3 5 8 13 34

2 3 5 8 21 34

2 3 5 13 21 34

2 3 8 13 21 34

2 5 8 13 21 34

3 5 8 13 21 34

题意很简单 给你一个长度为k(>=6)的序列 

让你输出一个长度为6的序列（递增）且这个序列至少要有一个数大于等于6

 

#include<iostream>
#include<cstdio>
#include<cmath>
#include<map>
#include<cstdlib>
#include<vector>
#include<set>
#include<queue>
#include<cstring>
#include<string.h>
#include<algorithm>
#define INF 0x3f3f3f3f
typedef long long ll;
typedef unsigned long long LL;
using namespace std;
int a[15],b[15];
int visited[15],n;
void DFS(int t,int num)
{
    if(num==6)
    {
        for(int i=0;i<5;i++)
            printf("%d ",b[i]);
        printf("%d\n",b[5]);
        return;
    }
    for(int i=t;i<n;i++)
    {
        if(visited[i]==0)
        {
            visited[i]=1;
            b[num]=a[i];
            DFS(i+1,num+1);
            visited[i]=0;
        }
    }
}

int main()
{
    int tt=0;
    while(scanf("%d",&n)!=EOF)
    {
        if(n==0)break;
        for(int i=0;i<n;i++)
            scanf("%d",&a[i]);
        if(tt)cout<<endl;
        tt++;
        memset(visited,0,sizeof(visited));
        DFS(0,0);
    }
    return 0;
}