include <bits/stdc++.h>

using namespace std;

int main() { int t; cin >> t; for (int l = 0; l < t; l++) { int n, k = 0; cin >> n; int a[n + 1]; for (int i = 0; i < n; i++) { cin >> a[i]; } for (int i = 0; i < n; i++) { if (a[i] > a[i + 1]) { k = max(k, a[i]); } } cout << k << endl; } }mefekmeffneofefiefkmefjkemfoepfkefiklwplcc;w cwpock'w,