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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios_base::sync_with_stdio(false);
  6.     cin.tie(NULL);
  7.  
  8.     int t;
  9.     cin >> t;
  10.  
  11.     while (t--) {
  12.         int n;
  13.         cin >> n;
  14.  
  15.         vector<double> sticks(n);
  16.         for (int i = 0; i < n; i++) {
  17.             cin >> sticks[i];
  18.         }
  19.  
  20.         // Special case: only 2 sticks
  21.         if (n == 2) {
  22.             cout << fixed << setprecision(6) << min(sticks[0], sticks[1]) << '\n';
  23.             continue;
  24.         }
  25.  
  26.         // Calculate sum of middle sticks
  27.         double middleSum = 0;
  28.         for (int i = 1; i < n - 1; i++) {
  29.             middleSum += sticks[i];
  30.         }
  31.  
  32.         // For n >= 3: max height = min(first + middle/2, last + middle/2)
  33.         double maxHeight = min(sticks[0] + middleSum / 2.0, sticks[n-1] + middleSum / 2.0);
  34.  
  35.         cout << fixed << setprecision(6) << maxHeight << '\n';
  36.     }
  37.  
  38.     return 0;
  39. }
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
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5
5
1 2 4 2 3
3
1 4 1
2
4 4
6
1 6 13 4 100 2
3
1 2 3
stdout
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5.000000
3.000000
4.000000
62.500000
2.000000
https://ideone.com/DLK510
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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