debug.h

#define TMP template<typename
template < class c > struct rge { c b, e; };
template < class c > rge<c> range(c i, c j) { return rge<c>{i, j}; }
template < class c > auto dud(c* x) -> decltype(cerr << *x, 0);
template < class c > char dud(...);
struct debug {
    ~debug() { cerr << endl; }
    template < class c > typename enable_if<sizeof dud<c>(0) != 1, debug&>::type operator<<(c i) { cerr << boolalpha << i; return * this; }
    template < class c > typename enable_if<sizeof dud<c>(0) == 1, debug&>::type operator<<(c i) { return * this << range(begin(i), end(i)); }
    template < class c, class b > debug & operator <<(pair < b, c > d) {
        return * this << "(" << d.first << ", " << d.second << ")";
    }
    template < class c > debug & operator <<(rge<c> d) {
        *this << "[";
        for (auto it = d.b; it != d.e; ++it)
            *this << ", " + 2 * (it == d.b) << *it;
        return * this << "]";
    }};
#define oo(...) __f(#__VA_ARGS__, __VA_ARGS__)
TMP Arg1>
void __f(const char *name, Arg1 &&arg1)
{cout << name << ": " << arg1 << "\n";}
TMP Arg1, typename... Args>
void __f(const char *names, Arg1 &&arg1, Args &&... args)
{const char *comma = strchr(names + 1, ',');cout.write(names, comma - names) << ": " << arg1 << " |";__f(comma + 1, args...);
}void in(int &x){
    cin  >> x;
}

// #ifdef LOCAL
// #include "mydebug.h"
// #else
// #define oo if(0)
// #define debug()  0
// #endif