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++ ,