96 lines
1.9 KiB
C++
96 lines
1.9 KiB
C++
#include <bits/stdc++.h> // {{{
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// https://codeforces.com/blog/entry/96344
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#pragma GCC optimize("O2,unroll-loops")
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#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
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using namespace std;
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template <typename T>
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constexpr T MIN = std::numeric_limits<T>::min();
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template <typename T>
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constexpr T MAX = std::numeric_limits<T>::max();
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template <typename T>
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[[nodiscard]] static T sc(auto&& x) {
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return static_cast<T>(x);
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}
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template <typename T>
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[[nodiscard]] static T sz(auto&& x) {
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return static_cast<T>(x.size());
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}
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template <typename... Args>
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void pr(std::format_string<Args...> fmt, Args&&... args) {
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std::print(fmt, std::forward<Args>(args)...);
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}
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template <typename... Args>
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void pr(std::format_string<Args...> fmt) {
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std::print(fmt);
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}
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template <typename... Args>
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void prln(std::format_string<Args...> fmt, Args&&... args) {
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std::println(fmt, std::forward<Args>(args)...);
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}
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template <typename... Args>
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void prln(std::format_string<Args...> fmt) {
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std::println(fmt);
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}
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using ll = long long;
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using ld = long double;
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template <typename T>
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using vec = std::vector<T>;
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#define ff first
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#define ss second
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#define eb emplace_back
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#define pb push_back
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#define all(x) (x).begin(), (x).end()
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#define rall(x) (x).rbegin(), (x).rend()
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#define FORI(a, b, c) for (int a = (b); a < (c); ++a)
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#define ROFI(a, b, c) for (int a = (b); a > (c); --a)
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#define FORLL(a, b, c) for (ll a = (b); a < (c); ++a)
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#define ROFLL(a, b, c) for (ll a = (b); a > (c); --a) // }}}
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void solve() {
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int n;
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cin >> n;
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int a;
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cin >> a;
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int l = a, r = a;
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bool done = false;
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while (--n) {
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cin >> a;
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if (!(a == l - 1 || a == r + 1)) {
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done = true;
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}
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l = min(l, a);
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r = max(r, a);
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}
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if (done)
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prln("NO");
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else
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prln("YES");
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}
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int main() { // {{{
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cin.tie(nullptr)->sync_with_stdio(false);
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int t = 1;
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cin >> t;
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while (t--) {
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solve();
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}
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return 0;
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} //}}}
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