poj 1011-sticks

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3187666 LKY 1011 Accepted 184K 62MS C++ 918B 2008-03-18 16:04:03 #include <iostream>
#include <algorithm>
using namespace std;
int stick[100], n;
bool used[100];
bool comp(int &a, int &b)
{
    return a > b;
}

bool dfs(int unused, int left, int len)
{
    if(unused == 0 && left == 0)
        return true;
    int i;
    if(left == 0) left = len;
    for (i=0; i<n; ++i)
    {
        if(!used[i] && stick[i]<=left)
        {
            used[i] = true;
            if(dfs(unused-1, left-stick[i], len))
                return true;
            used[i] = false;
            if(stick[i] == left || left == len)
                break;
        }
    }
    return false;
}
int main()
{
    int i, sum;
    while (scanf("%d", &n) != EOF && n)
    {
        sum = 0;
        for (i=0; i<n; ++i)
        {
            scanf("%d", &stick[i]);
            used[i] = false;
            sum += stick[i];
        }
        sort(stick, stick+n, comp);
        for (i=stick[0]; i<=sum; ++i)
        {
            if(sum % i == 0)
            {
                if(dfs(n, 0, i))
                {
                    printf("%d/n", i);
                    break;
                }
            }
        }
    }
    return 0;
}