usaco Zero Sum

/*
ID: modengd1
PROG: zerosum
LANG: C++
*/
#include <iostream>
#include <stdio.h>
#include <memory.h>

using namespace std;
int op[10];
void output(int limit)
{
    cout<<1;
    for(int i=0;i<limit-1;i++)
    {
        if(op[i]==0)
            cout<<‘+‘;
        else if(op[i]==1)
            cout<<‘-‘;
        else
            cout<<‘ ‘;
        cout<<i+2;
    }
    cout<<endl;
}
void slove(int limit,int deep)
{
    if(limit-1==deep)
    {
        int ans=0;
        int temp=1;
        int po=1;
        for(int i=0;i<limit-1;i++)
        {
            if(op[i]==0||op[i]==1)
            {
                ans+=po*temp;
                temp=i+1+1;
                if(op[i]==0)
                    po=1;
                else
                    po=-1;
            }
            else
            {
                temp=temp*10+i+1+1;
            }
        }
        ans+=po*temp;
        if(ans==0)
            output(limit);
        return ;
    }
    op[deep]=2;
    slove(limit,deep+1);
    op[deep]=0;
    slove(limit,deep+1);
    op[deep]=1;
    slove(limit,deep+1);
}
int main()
{
    freopen("zerosum.in","r",stdin);
    freopen("zerosum.out","w",stdout);
    int N;
    scanf("%d",&N);
    slove(N,0);
    return 0;
}