ural 1014【水題，不過有點陰人】

http://acm.timus.ru/problem.aspx?space=1&num=1014

題目雖水，但資料很陰，0竟然輸出10！！！害得我wa了幾次，還有要用long long防溢出

#include <vector>#include <list>#include <map>#include <set>#include <queue>#include <string.h>#include <deque>#include <stack>#include <bitset>#include <algorithm>#include <functional>#include <numeric>#include <utility>#include <sstream>#include <iostream>#include <iomanip>#include <cstdio>#include <cmath>#include <cstdlib>#include <limits.h>using namespace std;int lowbit(int t){return t&(-t);}int countbit(int t){return (t==0)?0:(1+countbit(t&(t-1)));}int gcd(int a,int b){return (b==0)?a:gcd(b,a%b);}int max(int a,int b){return a>b?a:b;}int min(int a,int b){return a>b?b:a;}#define LL long long#define pi acos(-1)#define N  200010#define INF INT_MAX#define eps 1e-8#define FRE freopen("a.txt","r",stdin)int main(){    LL n;    while(scanf("%I64d",&n)!=EOF)    {        if(n<10&&n!=0)        printf("%I64d\n",n);        else        if(!n)printf("10\n");        else        {            int i,j;            LL ans=0;            LL cnt=1;            int flag=1;            while(n>1)            {                for(i=9;i>1;i--)                {                    if(n%i==0)                    {                        ans+=i*cnt;                        cnt*=10;                        n/=i;                        break;                    }                }                if(i==1&&n>1)                {                    flag=0;                    break;                }            }            if(!flag)printf("-1\n");            else            printf("%I64d\n",ans);        }    }    return 0;}