这个模板还能加点什么

#include <bits/stdc++.h>

#define rep(i, a, b) for(int i = a; i <= b; i ++) 
#define reb(i, a, b) for(int i = a; i >= b; i --) 
#define mabs(x) ( (x) < 0 ? -(x) : (x) )
#define mceil(a,b) ( ((a) - 1) / (b) + 1 )
#define Vall(a) a.begin(), a.end() 
#define All(a, len) a + 1, a + len + 1
#define accsum(f, t) accumulate(f, t)
#define Vaccsum(f, t) accumulate(f, t) 
#define Max(f) max_element(f)
#define Min(f) min_element(f) 
#define debug(x) cout << #x << " = " << x << '\n';
#define fi first
#define se second
#define QWQ 0

using ll = long long ;
using ull = unsigned long long ;
using f64 = double ;
using f80 = long double ;

using namespace std;

int main() {

	

	return QWQ ; 
}