ititorit

    #include <bits/stdc++.h>
    using namespace std;
     
    #define FOR(i, a, b) for(int i = a; i <= b; i++)
    #define FORD(i, a, b) for(int i = a; i <  b; i++)
    #define REP(i, a, b) for(int i = a; i >= b; i--)
    #define REPD(i, a, b) for(int i = a; i >  b; i--)

    #define DEBUG(x) { cout << #x << " = " << x << endl; }

ititorit

#include <bits/stdc++.h>

#define _for(i,a,b) for(int i=(a),_b_=(b),_d_=(a<b?1:-1);i!=_b_;i+=_d_)
#define FOR(i,a,b) for(int i = a; i <= b; i++)
#define _it(i,v) for (typeof((v).begin()) i = (v).begin(); i != (v).end(); ++i)
#define _all(v) v.begin(), v.end()

#define DEBUG(x) { cout << #x << " = " << x << endl; }
#define sqr(x) ((x)*(x))