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Interview Question Judge Route Circle

Last update: 11/26/2017 9:43:00 PM

By Fatih KABAKCI

The problem is to determine if movements of a robot end up in starting point that is 0,0 in the beginning.

Problem #657 - Judge Route Circle

Description: Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, which means it moves back to the original place.

The move sequence is represented by a string. And each move is represent by a character. The valid robot moves are R (Right), L (Left), U (Up) and D (down). The output should be true or false representing whether the robot makes a circle.

Example 1:
Input: "UD"
Output: true
Example 2:
Input: "LL"
Output: false

Difficulty: Easy

Solution in Java

package com.fatihkabakci.Easy.JudgeRouteCircle;

/**
 * @author fkabakci 
 * Problem Description: Initially, there is a Robot at position (0, 0). 
 * Given a sequence of its moves, judge if this robot makes a circle, 
 * which means it moves back to the original place.
 * The move sequence is represented by a string. And each move is represent by a character. 
 * The valid robot moves are R (Right), L (Left), U (Up) and D (down). 
 * The output should be true or false representing whether the robot makes a circle.
 * 
 * Example 1:
 * Input: "UD"
 * Output: true
 * 
 * Example 2:
 * Input: "LL"
 * Output: false
 */

public class Solution {
	public boolean judgeCircle(String moves) {
		int x = 0, y = 0;
		for (int i = 0; i < moves.length(); i++) {
			char direction = moves.charAt(i);
			switch (direction) {
			case "U":
				y++;
				break;
			case "D":
				y--;
				break;
			case "R":
				x++;
				break;
			case "L":
				x--;
				break;
			}
		}
		return x == 0 && y == 0;
	}

	public static void main(String[] args) {
		boolean isCircle = new Solution().judgeCircle("UURRDDLL");
		if(isCircle)
			System.out.println("Robot came back !");
		else
			System.out.println("Robot is gone !");
	}
}

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