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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int t;
  6.     cin >> t;
  7.  
  8.     while (t--) {
  9.         int n;
  10.         cin >> n;
  11.  
  12.         int m = 0, r = n;
  13.         while (m < r) {
  14.             int mid = (m + r) / 2;
  15.             if (3 + 3 * mid <= n - 3) {
  16.                 m = mid + 1;
  17.             } else {
  18.                 r = mid;
  19.             }
  20.         }
  21.  
  22.         cout << m - 1 << endl;
  23.     }
  24.  
  25.     return 0;
  26. }
  27.  
Success #stdin #stdout 0.01s 5288KB
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/MMLg8K
language:
C++ (gcc 8.3)
created:
39 days ago
visibility:
public

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