cf template

#include <assert.h>
#include <bits/stdc++.h>
using namespace std;
#define dbg(...) logger(#__VA_ARGS__, __VA_ARGS__)
template <typename... Args> void logger(string vars, Args &&... values)
{
    cerr << vars << " = ";
    string delim = "";
    (..., (cerr << delim << values, delim = ", "));
    cerr << endl;
}
#define DEBUG
#ifdef DEBUG
#define DEBUG_CMD(cmd)                                                                             \
    do {                                                                                           \
        cmd;                                                                                       \
    } while (false)
#else
#define DEBUG_CMD(cmd)                                                                             \
    do {                                                                                           \
        ;                                                                                          \
    } while (false)
#endif
#define _DEBUG_CMD(cmd)                                                                            \
    do {                                                                                           \
        ;                                                                                          \
    } while (false)

template <class T> using mpq = priority_queue<T, vector<T>, greater<T>>;
using ll = long long;
using pii = pair<int, int>;

int main(int argc, char **argv)
{
    int a = 1, b = 2, c = 3;
    dbg(a, b, c);
    DEBUG_CMD({
        static int dbg_val = 0;
        if (((dbg_val++) % 100) == 0) {
            printf("in every 100 run, a=%d b=%d c=%d\n", a, b, c);
        }
    });
    return 0;
};