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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5.     int t;
  6.     cin >> t;
  7.     while (t--)
  8.     {
  9.         int n;
  10.         cin >> n;
  11.         int m = 0, r = n, mid = (m + r) / 2;
  12.         while (m < r)
  13.         {
  14.             mid = (m + r) / 2;
  15.             if (3 + 3 * mid <= n - 3)
  16.             {
  17.                 m = mid + 1;
  18.             }
  19.             else
  20.             {
  21.                 r = mid;
  22.             }
  23.             // cout << l << " " << r << endl;
  24.         }
  25.         cout << m - 1 << endl;
  26.     }
  27. }
Success #stdin #stdout 0.01s 5304KB
comments (?)
stdin
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3
5
1 2 3 4 5
1
1033
5
600 900 1300 2000 2550
stdout
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-1
-1
-1
https://ideone.com/qH7vir
language:
C++ (gcc 8.3)
created:
39 days ago
visibility:
public

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