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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long 
  4. #define FIO ios_base::sync_with_stdio(0);  cin.tie(0); cout.tie(0);
  5. #define el '\n';
  6. #define yes cout << "yes" << el;
  7. #define no cout << "no" << el;
  8.  
  9. int l,r;
  10. ll sum;
  11. void next(int l,int r)
  12. {
  13.     if(l == r + 1) return;
  14.     if(4 - l >= 0){
  15.         sum+=4;
  16.         next(l+1,r);
  17.     }
  18.     else if(7 - l >= 0){
  19.         sum+=7;
  20.         next(l+1,r);
  21.     }
  22. }
  23. int main()
  24. {
  25.    FIO;
  26.  
  27.     // Moneer's coding space            
  28.     cin >> l >> r;
  29.     next(l,r);
  30.     cout << sum << el;
  31.  
  32. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/twKH8y
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
public

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