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  1. #include <bits/stdc++.h>
  2. #define aa long long
  3. using namespace std;
  4. aa int sum(aa int n)
  5. {
  6.     aa int rev=0,num;
  7.     while(n!=0)
  8.     {
  9.         num = n%10;
  10.         rev = rev + num;
  11.         n = n/10;
  12.     }
  13.     return rev;
  14. }
  15. int main()
  16. {
  17.    ios_base::sync_with_stdio(false);
  18.    aa int a,b;
  19.    cin>>a>>b;
  20.    while(a!=-1 || b!=-1)
  21.    {
  22.        aa int ans=0;
  23.        for(int i=a;i<=b;i++)
  24.        {
  25.            ans += sum(i);
  26.        }
  27.        cout<<ans<<endl;
  28.        cin>>a>>b;
  29.    }
  30. }
  31.  
Success #stdin #stdout 0s 3232KB
comments (?)
stdin
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1 10
100 777
-1 -1
stdout
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46
8655
https://ideone.com/wuSqe7
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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