11494-Queen.cpp

/*
 * FILE: Queen-11494.cpp
 *
 * @author: Md. Arafat Hasan Jenin <opendoor.Arafat<at>gmail<dot>com>
 *
 * LINK:
 *
 * Description:
 *
 * DEVELOPMENT HISTORY:
 *       Date        Change          Version     Description
 * --------------------------------------------------------------
 *    02 Mar 2017    New             1.0        AC
 *
 */


#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
#include <climits>
#include <cmath>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <iomanip>

#define FileIn(file) freopen("input.txt", "r", stdin)
#define FileOut(file) freopen("output.txt", "w", stdout)
#define FOR(i, a, b) for (int i=a; i<=b; i++)
#define ROF(i, b, a) for (int i=b; i>=a; i--)
#define REP(i, n) for (int i=0; i<n; i++)
#define Fill(ar, val) memset(ar, val, sizeof(ar))
#define uint64 unsigned long long
#define all(ar) ar.begin(), ar.end()
#define pb push_back


/*****************____________BIT_OPERATIONS____________****************/
#define bit(n) (1 << (n)) //2^n
//check ith bit of integer n, 0 or 1
#define bitchk(n, i) ((n & (1 << i))? 1 : 0)
#define bit_on(n, i) (n | (1 << i)) //set ith bit ON of the integer n
#define bit_off(n, i) (n & ~(1 << i)) //set ith bit OFF of the intger n
//toggle ith bit of integer n, set 0 if 1, set 1 if 0
#define bit_toggle(n, i) (n ^ ( 1 << i))
//set ith bit to x (x is bool, 1 or 0) of the integer n
#define bit_setx(n, x, i) (n ^ ((-x ^ n) & (1 << i)))


#define nl cout << endl;
#define lck cout << "______________" << endl;

typedef long long ll;
using namespace std;

int main() {

    int x1, y1, x2, y2;
    while(cin >> x1 >> y1 >> x2 >> y2 && x1 && y1 && x2 && y2){
        if((x1==x2&&y1==y2))
            cout << 0 << endl;
        else if((x1==x2||y1==y2)||(x1-x2==y1-y2)||(x1-x2==-(y1-y2)))
            cout << 1 << endl;
        else cout << 2 << endl;
    }

    return 0;
}