代码模板

//代码模板, 来自 rbook.roj.ac.cn
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

//====== log 调试用
// 使用: int a,b,c; log(a,b,c)
#ifndef DEBUG
#define log(...)
#define fenc(...) ;
#else
#define fenc cout << "\n=================\n";
#define log(args...) { cout << "LINE:" << __LINE__ << " : ";string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); stringstream _ss(_s); istream_iterator<string> _it(_ss); err(_it, args); }
void err(istream_iterator<string> it) {}

template<typename T>
void err(istream_iterator<string> it, T a) {
cerr << *it << " = " << a << "\n";
}

template<typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args) {
cerr << *it << " = " << a << ", ";
err(++it, args...);
}
#endif

const int maxn = 1e6+5;
int n,m;
int a[maxn];

int main () {
    std::ios::sync_with_stdio(false); cin.tie(0); cout.tie(0); // 关闭io同步
    

    return 0;
}