102 lines
1.7 KiB
C++
102 lines
1.7 KiB
C++
#include <bits/stdc++.h> // {{{
|
|
|
|
// https://codeforces.com/blog/entry/96344
|
|
|
|
#pragma GCC optimize("O2,unroll-loops")
|
|
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
|
|
|
|
using namespace std;
|
|
|
|
using i32 = int32_t;
|
|
using u32 = uint32_t;
|
|
using i64 = int64_t;
|
|
using u64 = uint64_t;
|
|
using f64 = double;
|
|
using f128 = long double;
|
|
|
|
#if __cplusplus >= 202002L
|
|
template <typename T>
|
|
constexpr T MIN = std::numeric_limits<T>::min();
|
|
|
|
template <typename T>
|
|
constexpr T MAX = std::numeric_limits<T>::max();
|
|
|
|
template <typename T>
|
|
[[nodiscard]] static T sc(auto&& x) {
|
|
return static_cast<T>(x);
|
|
}
|
|
|
|
template <typename T>
|
|
[[nodiscard]] static T sz(auto&& x) {
|
|
return static_cast<T>(x.size());
|
|
}
|
|
#endif
|
|
|
|
static void NO() {
|
|
std::cout << "NO\n";
|
|
}
|
|
|
|
static void YES() {
|
|
std::cout << "YES\n";
|
|
}
|
|
|
|
template <typename T>
|
|
using vec = std::vector<T>;
|
|
|
|
#define all(x) (x).begin(), (x).end()
|
|
#define rall(x) (x).rbegin(), (x).rend()
|
|
#define ff first
|
|
#define ss second
|
|
|
|
#ifdef LOCAL
|
|
#define db(...) std::print(__VA_ARGS__)
|
|
#define dbln(...) std::println(__VA_ARGS__)
|
|
#else
|
|
#define db(...)
|
|
#define dbln(...)
|
|
#endif
|
|
// }}}
|
|
|
|
void solve() {
|
|
u32 n, k;
|
|
cin >> n >> k;
|
|
|
|
vec<u64> h(n);
|
|
for (auto& e : h)
|
|
cin >> e;
|
|
|
|
u64 level = 1;
|
|
u64 height = h[k - 1];
|
|
|
|
sort(all(h));
|
|
|
|
h.erase(unique(all(h)), h.end());
|
|
u32 index = distance(h.begin(), upper_bound(all(h), height)) - 1;
|
|
|
|
while (height < h.back()) {
|
|
if (h[index + 1] - h[index] <= height - level + 1) {
|
|
level += h[index + 1] - h[index];
|
|
height = h[++index];
|
|
} else {
|
|
NO();
|
|
return;
|
|
}
|
|
}
|
|
|
|
YES();
|
|
}
|
|
|
|
int main() { // {{{
|
|
cin.tie(nullptr)->sync_with_stdio(false);
|
|
cin.exceptions(cin.failbit);
|
|
|
|
u32 tc = 1;
|
|
cin >> tc;
|
|
|
|
for (u32 t = 0; t < tc; ++t) {
|
|
solve();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
// }}}
|