Things to #define

[dotoleeoak]

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef vector<int> vi; 
typedef vector<pair<int,int>> vpi; 
 
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)
 
#define pb push_back
#define rsz resize
#define sz(x) int(x.size())
#define all(x) begin(x), end(x)
#define f first
#define s second

추가 trick 참고: https://codeforces.com/blog/entry/15643