**Description**

**Input**

**Output**

**Sample Input**

9

5 2 1 5 2 1 5 2 1

4

1 2 3 4

0

**Sample Output**

6

5 The question ： Yes n Duan stick , Request this n It's made of two sticks x A stick of the same length , Make the new stick as short as possible , Output min ？ Ideas ： Search for , The length of the new stick must be greater than or equal to the maximum of the original stick maxlen, Less than or equal to the total length of these sticks sum, So growing up （maxlen~sum） Traverse these values , If sum%i!=0 , You can't make a legal stick and jump over it ;

If sum%i==0, Then it's possible to satisfy , Search . search process ： Deep search one by one , The record has been put together into several sticks at present , How long is it from the stick , Used sticks v[i] marked . The code is as follows ：

#include <iostream>

#include <algorithm>

#include <cstdio>

#include <cstring>

using namespace std;

int start,sum;

int v[]; int check(int num,int rest,int pos)

{

if(num==sum/start) return ;

rest-=pos; v[pos]--;

if(rest==)

{

int i;

for(i=; i>=; i--) if(v[i]) break;

int flag=check(num+,start,i);

v[pos]++;

return flag;

}

for(int i=rest; i>=; i--)

{

if(!v[i]) continue;

int flag=check(num,rest,i);

if(flag) return ;

}

v[pos]++;

return ;

} int main()

{

int n;

while(scanf("%d",&n)&&n)

{

int maxn=-;

sum=;

memset(v,,sizeof(v));

for(int i=; i<=n; i++)

{

int x; scanf("%d",&x);

sum+=x;

v[x]++;

maxn=max(maxn,x);

}

for(start=maxn; start<=sum; start++)

{

if(sum%start!=) continue;

if(check(,start,maxn))

{

printf("%d\n",start);

break;

}

}

}

return ;

}

/**

9

21 16 33 36 19 1 35 6 47

ans=107 43

46 16 47 31 22 48 10 47 25 48 33 31 35 33 14 21 8 22 20 37 20 48 8 18 3 44 28 16 9 50 44 18 46 28 43 49 18 19 31 46 3 43 43

ans=141

*/ /**

20

4 2 1 6 6 5 6 9 1 0 6 9 0 4 8 3 2 1 1 6

20

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

*/

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