#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <cstring>
#include <cstdarg>
#include <cmath>
#include <vector>
#include <map>
#include <string>
#include <set>
#include <list>
#include <unordered_map>
#include <algorithm>
#include <ostream>
#include <iosfwd>
#include <atomic>