UVA – 11494 – Queen

#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;

int main() {
	int x1,y1,x2,y2;
	while(scanf("%d %d %d %d", &x1, &y1, &x2, &y2)>0 && x1 && y1 && x2 && y2){
		if(x1==x2 && y1==y2) puts("0");
		else if(x1==x2 || y1==y2 || abs(y1-y2)==abs(x1-x2)) puts("1");
		else puts("2");
	}
	return 0;
}
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