C++ debug header. Use -DDBUG_ option when compiling. Many thanks for https://www.creativ.xyz/dump-cpp-652/

debug.hpp

#include <iostream>
#include <map>
#include <set>
#include <string>
#include <vector>

using namespace std;

#define repi(itr, ds) for (auto itr = ds.begin(); itr != ds.end(); itr++)

// pair
template <typename T, typename U>
ostream &operator<<(ostream &os, pair<T, U> &pair_var) {
    os << "(" << pair_var.first << ", " << pair_var.second << ")";
    return os;
}
// vector
template <typename T>
ostream &operator<<(ostream &os, const vector<T> &vec) {
    os << "{";
    for (unsigned long i = 0; i < vec.size(); i++) {
        os << vec[i] << (i + 1 == vec.size() ? "" : ", ");
    }
    os << "}";
    return os;
}
// vector of vector
template <typename T>
ostream &operator<<(ostream &os, const vector<vector<T>> &vec) {
    os << "{";
    for (unsigned long i = 0; i < vec.size(); i++) {
        os << "{";
        for (unsigned long j = 0; j < vec[i].size(); j++) {
            os << vec[i][j] << (j + 1 == vec[i].size() ? "" : ", ");
        }
        os << "}" << (i + 1 == vec.size() ? "" : ", ");
    }
    os << "}";
    return os;
}
// map
template <typename T, typename U>
ostream &operator<<(ostream &os, map<T, U> &map_var) {
    os << "{";
    repi(itr, map_var) {
        os << *itr;
        itr++;
        if (itr != map_var.end()) os << ", ";
        itr--;
    }
    os << "}";
    return os;
}
// set
template <typename T>
ostream &operator<<(ostream &os, set<T> &set_var) {
    os << "{";
    repi(itr, set_var) {
        os << *itr;
        itr++;
        if (itr != set_var.end()) os << ", ";
        itr--;
    }
    os << "}";
    return os;
}

#define DUMPOUT cerr

void dump_func() {
    DUMPOUT << endl;
}
template <class Head, class... Tail>
void dump_func(Head &&head, Tail &&... tail) {
    DUMPOUT << head;
    if (sizeof...(Tail) > 0) {
        DUMPOUT << ", ";
    }
    dump_func(std::move(tail)...);
}
#ifdef DEBUG_
#define DEB
#define dump(...)                                                                \
      DUMPOUT << "[" << __FUNCTION__ << ":" << to_string(__LINE__) << "]"        \
              << " " << string(#__VA_ARGS__) << " = ",                           \
          dump_func(__VA_ARGS__)
#else
#define DEB if (false)
#define dump(...)
#endif