play Lotto(超郁闷的题目)
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Description
In the German Lotto you have 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 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 78 1 2 3 5 8 13 21 340
Sample Output
1 2 3 4 5 61 2 3 4 5 71 2 3 4 6 71 2 3 5 6 71 2 4 5 6 71 3 4 5 6 72 3 4 5 6 71 2 3 5 8 131 2 3 5 8 211 2 3 5 8 341 2 3 5 13 211 2 3 5 13 341 2 3 5 21 341 2 3 8 13 211 2 3 8 13 341 2 3 8 21 341 2 3 13 21 341 2 5 8 13 211 2 5 8 13 341 2 5 8 21 341 2 5 13 21 341 2 8 13 21 341 3 5 8 13 211 3 5 8 13 341 3 5 8 21 341 3 5 13 21 341 3 8 13 21 341 5 8 13 21 342 3 5 8 13 212 3 5 8 13 342 3 5 8 21 342 3 5 13 21 342 3 8 13 21 342 5 8 13 21 343 5 8 13 21 34
对于这么一个水题,我做的差点吐血!!
这个题目可谓跟组合的输出一摸一样
方法嘛:简单递归呗!
对于我吐血的地方见代码!!
我的代码
#include<stdio.h>
int t[20],f[20];
int n;
int fun(int a,int b)
{
//printf("%d ",n);
int j,i;
for(i=a;i<=n+b-6; i++)
{
t[b] = f[i];
//printf("%d ",t[b]);
if (b==6)
{
for( j = 1; j <6;j ++ )
{
printf("%d ",t[j]);
}
printf( "%d/n",t[6]);
}
else fun(i+1,b+1);
}
return 0;
}
int main()
{
//int n 本来我这里有这么一个习惯性的语句,导致N不是全局变量,以至于FUN函数中N为0;我还跟步找了好几遍!!吐血啊!
int i;
int tag=0;
while(scanf("%d", &n)!=EOF&&n)
{
for(i=1 ;i<=n;i++)
scanf( "%d", &f[i]);
//printf("%d ",n);
if(tag) printf("/n");
fun(1,1);
tag=1;
}
return 0;
}
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