How to Solve Robot Return to Origin Problem
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Robot Return to Origin
There is a robot starting at the position (0, 0), the origin, on a 2D plane. Given a sequence of its moves, judge if this robot ends up at (0, 0) after it completes its moves. You are given a string m...
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Understanding the Robot Return to Origin Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
There is a robot starting at the position (0, 0), the origin, on a 2D plane. Given a sequence of its moves, judge if this robot ends up at (0, 0) after it completes its moves. You are given a string moves that represents the move sequence of the robot where moves[i] represents its ith move. Valid moves are 'R' (right), 'L' (left), 'U' (up), and 'D' (down). Return true if the robot returns to the origin after it finishes all of its moves, or false otherwise. Note: The way that the robot is "facing" is irrelevant. 'R' will always make the robot move to the right once, 'L' will always make it move left, etc. Also, assume that the magnitude of the robot's movement is the same for each move.
Robot Return to Origin
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Examples
moves = "UD"trueThe robot moves up once, and then down once. All moves have the same magnitude, so it ended up at the origin where it started. Therefore, we return true.
moves = "LL"falseThe robot moves left twice. It ends up two "moves" to the left of the origin. We return false because it is not at the origin at the end of its moves.
Constraints
1 <= moves.length <= 2 * 104moves only contains the characters 'U', 'D', 'L' and 'R'.How Interview Coder Helps with Leetcode Problems
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