883M - Quadcopter Competition - CodeForces Solution

#include<bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define ARP_TEAM  ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define sq(x)   (x)*(x)
#define PI      acos(-1.0)
#define all(x) x.begin(),x.end()
#define nl      '\n'
#define mod 1000000007
typedef long long int ll;
typedef unsigned long long int  llu;

int main()
{
    ARP_TEAM;
    int a, b, x, y;
    cin >> a >> b >> x >> y;
    if(a==x)a++;
    if(b==y)b++;
    cout << 2*(abs(a-x)+abs(b-y)+2);
    return 0;
}