A_Guess_the_Maximum.cpp

#include <bits/stdc++.h>
#define int long long
#define ab adityabelgaonkar
using namespace std;

void main()
{
  int t;
  cin >> t;
  while (t--)
  {
    int n;
    cin >> n;
    vector<int> a(n);
    for (auto &i : a)
      cin >> i;

    vector<int> b;

    for (int i = 0; i < n - 1; ++i)
    {
      b.push_back(max(a[i], a[i + 1]));
    }

    int largestsofar = INT_MAX;

    for (auto i : b)
    {
      largestsofar = min(i, largestsofar);
    }

    cout << largestsofar - 1 << "\n";
  }

  // return 0;
}