debugger.h

#include <bits/stdc++.h>
using namespace std;

#define dbg(x...) cerr << "[" << #x << "] = ["; _print(x)

void __print(int32_t x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(int64_t x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
template<typename T>void __print(complex<T> x) {cerr << '{'; __print(x.real()); cerr << ','; __print(x.imag()); cerr << '}';}

template<typename T>
void __print(const T &x);

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto it = x.begin() ; it != x.end() ; it++) cerr << (f++ ? "," : ""), __print(*it); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}