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HDU Good Numbers (热身赛2)

分析:一道水题、找下规律就OK了、不过要注意特判一下0、因为0也是good number、这个把我坑惨了= =|||
#include<iostream>  
#include<cstdio>  
#include<cstdlib>  
#include<cstring>  
using namespace std;  
int main(){  
    __int64 a,b;  
    int t,step=1;  
    scanf("%d",&t);  
    while(t--){  
        scanf("%I64d%I64d",&a,&b);  
        __int64 ans;  
        __int64 sa,sb;  
        int flag=0;  
        if(b>=10){  
            __int64 s=b;  
            __int64 sum=0;  
            while(s!=0){  
                sum+=s%10;  
                s/=10;  
            }  
            sum=sum-b%10;  
            sum%=10;  
            if(sum==0 || sum+b%10>=10)  
            flag=0;  
            else  
            flag=1;  
            sb=b/10-flag;  
        }  
        else  
        sb=0;  
        flag=0;  
        if(a>=11){  
            __int64 s=a-1;  
            __int64 sum=0;  
            while(s!=0){  
                sum+=s%10;  
                s/=10;  
            }  
            sum=sum-(a-1)%10;  
            sum%=10;  
            if(sum==0 || sum+(a-1)%10>=10)  
            flag=0;  
            else  
            flag=1;  
            sa=(a-1)/10-flag;  
        }  
        else  
        sa=0;  
        if(a==0 || b==0)  
        sb++;  
        printf("Case #%d: %I64d\n",step++,sb-sa);  
    }  
    return 0;  
}  

 


补充:软件开发 , C++ ,
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