补题补题补题~~~~really big numbers

不是啥难题，直接上代码吧。

B - Really Big Numbers

#include<string.h>
#include<math.h>
#include<stdlib.h>

int  BigNumbers(long long n)
{
int sum = 0;
while(n>0)
{
sum += n%10;
n /= 10;
}
return sum;
}

int main()
{
long long N,S;
scanf("%lld %lld",&N,&S);
for(long long i=S+1 ; i<=N ; i++)
{
if(i - BigNumbers(i)>=S){
printf("%lld",N-i+1);
return 0;
}
else if(i == S+162){
printf("%lld",N-i+1);
return 0;
}
}
printf("0");
return 0;
}