HDU 1342 Lotto 【DFS】

Lotto

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)

Total Submission(s): 1610 Accepted Submission(s): 792

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

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
#define maxn 1005
#define inf 0x3f3f3f3f
int n;
int a[maxn];
int b[maxn];
bool vis[maxn];
int flag;
void dfs(int dep,int last){
    flag=1;
   if(dep>=6){
    for(int i=0;i<5;i++){
        printf("%d ",b[i]);
    }
    printf("%d\n",b[5]);
    return ;
   }
   for(int i=0;i<n;i++){
    if(!vis[i]&&a[i]>=last){
        b[dep]=a[i];
        vis[i]=true;
        dfs(dep+1,a[i]);
        vis[i]=false;
    }
   }
}
int main()
{
    flag=0;
    //freopen("in.txt","r",stdin);
    while(~scanf("%d",&n)&&n){
            if(flag==1)puts("");
            memset(vis,0,sizeof vis);
        for(int i=0;i<n;i++)
            scanf("%d",&a[i]);
            dfs(0,-10000);
    }
}

时间： 2024-09-30 00:32:28

HDU 1342 Lotto 【DFS】

Lotto

HDU 1342 Lotto 【DFS】的相关文章

hdoj 1342 Lotto【dfs】

【dfs】hdu 1016 Prime Ring Problem

HDU 6113 度度熊的01世界【DFS】（2017"百度之星"程序设计大赛 - 初赛（A））

【dfs】hdu 1175 连连看

hdoj 1045 Fire Net 【DFS】

hdoj 1016 Prime Ring Problem 【DFS】

poj 3009 Curling 2.0 【DFS】

NYOJ 587 blockhouses 【DFS】

NYOJ 722 数独【DFS】+【预处理】