HDU2848 Number Cutting Game

#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define se second
#define fs first
#define LL long long
#define CLR(x) memset(x,0,sizeof x)
#define MC(x,y) memcpy(x,y,sizeof(x))  
#define SZ(x) ((int)(x).size())
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin();it!=(c).end();it++)
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1 
typedef pair<int,int> P;
const double eps=1e-9;
const int maxn=200100;
const int mod=1e9+7;
const int INF=1e9;

LL Base[22];

void makebase()
{
    Base[1]=10;
    for(int i=2;i<22;i++) Base[i]=Base[i-1]*10;
}

bool dfs(LL,int);

bool test(LL n,int d,int k,LL cur)
{
    if(d==k) return !dfs(cur+n,k);
    for(int i=1;i<22;i++)
    {
        LL a=n%Base[i];
        LL b=n/Base[i];
        if(!b) break;
        if(test(b,d+1,k,cur+a)) return true;
    }
    return false;
}


bool dfs(LL n,int k)
{
    if(n<Base[k-1]) return false;
    return test(n,1,k,0);
}

int main()
{
    LL n;
    int k;
    makebase();
    while(~scanf("%lld%d",&n,&k))
    {
        int flag=dfs(n,k);
        printf("%d\n",flag);
    }
    return 0;
}