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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define fast_io ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)
  5. #define int long long
  6. #define rep(i,a,b) for(int i=a;i<b;++i)
  7. #define yes cout << "YES\n"
  8. #define no cout << "NO\n"
  9.  
  10. void solve() {
  11.     int n; cin >> n;
  12.     int* a = new int[n];
  13.     rep(i, 0, n) cin >> a[i];
  14.  
  15.     if (n == 1) {
  16.         yes;
  17.         delete[] a;
  18.         return;
  19.     }
  20.  
  21.     int i = 0;
  22.     while (i + 1 < n && a[i] <= a[i + 1]) ++i;
  23.     if (i == 0 || i == n - 1) { 
  24.         no;
  25.         delete[] a;
  26.         return;
  27.     }
  28.     while (i + 1 < n && a[i] >= a[i + 1]) ++i;
  29.  
  30.     if (i == n - 1) yes;
  31.     else no;
  32.  
  33.     delete[] a;
  34. }
  35.  
  36. int32_t main() {
  37.     fast_io;
  38.     int t; cin >> t;
  39.     while (t--) solve();
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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4
4
5 6 1 1
3
3 1 2
3
40 60 90
2
1 1
stdout
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YES
NO
NO
NO
https://ideone.com/H9gRU2
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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