rt，为了配合码头使用的，码头如下

// author: lzyqwq
// #pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/hash_policy.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define co const
#define TOSNU tree_order_statistics_node_update
#define eb emplace_back
#define ep emplace
#define bg begin
// #define int long long
// #define int __int128
using i64 = long long; using u64 = unsigned i64;
using i128 = __int128; using namespace std;
// using namespace __gnu_pbds;
// using namespace __gnu_cxx;
co int N = 114514; co u64 B = 1145141; co i64 M = 1e9 + 7;

void init_main() {

}
void qingkong() {

}
void work() {
    qingkong();

}
signed main() {
    // cin.tie(0), cout.tie(0), ios::sync_with_stdio(0);
    init_main(); int testcases = 1;
    // cin >> testcases;
    // read(testcases);
    while (testcases--) work(); return 0;
}