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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.  
  48. ll sum(ll mid)
  49. {
  50.     return (mid * (mid + 1)) / 2;
  51. }
  52. int main()
  53. {
  54.     soso();
  55.     int t; cin >> t;
  56.     while (t--)
  57.     {
  58.         ll x; cin >> x;
  59.         ll l = 1, r = 1e19, ans = 0;
  60.         while (l <= r)
  61.         {
  62.             ll mid = (l + r) / 2;
  63.             if (x > sum(mid))l = mid + 1;
  64.             else
  65.             {
  66.                 ll l22 = sum(mid - 1)+1, r22 = sum(mid);
  67.                 while (l22 <= r22)
  68.                 {
  69.                     ll mid22 = (l22 + r22) / 2;
  70.                     if (mid22 == x) { ans = mid; break; }
  71.                     if (mid22 < x)l = mid22 + 1;
  72.                     if (mid22 > x)r = mid22 - 1;
  73.                 }
  74.                 if (ans == 0)r = mid - 1;
  75.                 else break;
  76.             }
  77.         }
  78.         cout << ans << "\n";
  79.     }
  80.  
  81. }
Success #stdin #stdout 0s 5304KB
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https://ideone.com/sn1AAb
language:
C++ (gcc 8.3)
created:
13 days ago
visibility:
public

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