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  1. //Believe in yourself ,( try and try and then try ), You can do it 
  2. //You don't have to be great to start but you have to start to be great 
  3. #include <iostream>
  4. #include<algorithm>
  5. #include<cmath>
  6. #include<string>
  7. #include<vector>
  8. #include <utility>
  9. #include <stack>
  10. #include <set>
  11. #include <map>
  12. #include<queue>
  13. #include<set>
  14. // 2D vector vector<vector<int>>v(n,vector<int>(m));
  15. // sort and reverse in vector sort(v.begin(), v.end(), greater<int>());
  16. // str.erase(pos,len); erase in string
  17. // a = s.substr(0, i)<<before i, b = s.substr(i)<<from i to end;
  18. // cout << (v[0] == 1 ? "YES" : "NO") << endl;
  19. // unsigned long long int
  20. // priority_queue<ll, vector<ll>, greater<ll>> p;
  21. using namespace std;
  22. #define ll long long
  23. #define all(c)  c.begin(),c.end()
  24.  
  25.  
  26. ll gcd(ll a, ll b)
  27. {
  28.     while (b != 0)
  29.     {
  30.         ll a2 = a;
  31.         a = b;        b = a2 % b;
  32.     }
  33.     return  a;
  34. }
  35.  
  36. ll lcm(ll a, ll b)
  37. {
  38.     return a / gcd(a, b) * b;
  39. }
  40.  
  41. void soso()
  42. {
  43.     ios::sync_with_stdio(0);
  44.     cin.tie(NULL);
  45.     cout.tie(NULL);
  46. }
  47. vector<ll>tri(100000);
  48. int main()
  49. {
  50.     soso();
  51.     for (int i = 0; i <= 100000; i++)
  52.     {
  53.         tri[i] = (i * (i + 1)) / 2;
  54.     }
  55.     int t; cin >> t;
  56.     while (t--)
  57.     {
  58.         ll l, r; cin >> l >> r;
  59.         ll x = lower_bound(tri.begin(), tri.end(), l) - tri.begin(); 
  60.         ll y = lower_bound(tri.begin(), tri.end(), r) - tri.begin();
  61.  
  62.         if (tri[y] > r)y--;
  63.         cout << (y - x) + 1 << "\n";
  64.  
  65.     }
  66.  
  67. }
Success #stdin #stdout 0.01s 5304KB
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https://ideone.com/L4DjRW
language:
C++ (gcc 8.3)
created:
10 days ago
visibility:
public

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