A bit of math but an otherwise really simple problem. I would have voted this as harder than the earlier problems as you need to figure out certain numbers based on the direction you are rotating.

import java.io.PrintWriter;
import java.util.Scanner;
/**
*
* @author Sanchit M. Bhatnagar
* @see http://uhunt.felix-halim.net/id/74004
*
*/
public class P10550 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
PrintWriter out = new PrintWriter(System.out);
while (sc.hasNextLine()) {
int degree = sc.nextInt();
int first = sc.nextInt();
int second = sc.nextInt();
int third = sc.nextInt();
if (first == second && second == third && third == degree && degree == first) {
break;
} else {
out.println(doSolve(degree, first, second, third));
}
}
out.close();
sc.close();
}
private static long doSolve(int degree, int first, int second, int third) {
// 40 numbers = 360 degrees. 1 number = 9 degrees.
long ans = 0;
// 2 clockwise turns.
ans += 720;
// To first number
ans += 9 * findWay(degree, first, 0);
// One counterclockwise turn
ans += 360;
// To second number
ans += 9 * findWay(first, second, 1);
// To third number
ans += 9 * findWay(second, third, 0);
return ans;
}
private static int findWay(int from, int to, int cw) {
//Could memo this technically.
int count = 0;
if (cw == 1) {
while (from != to) {
from++;
if (from == 40)
from = 0;
count++;
}
} else {
while (from != to) {
from--;
if (from == -1)
from = 39;
count++;
}
}
return count;
}
}

### Like this:

Like Loading...