657. Judge Route Circle

657. Judge Route Circle

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

class Solution { public boolean judgeCircle(String moves) { int v = 0, h = 0; for (char move : moves.toCharArray()) { switch (move) { case 'U': v++; break; case 'D': v--; break; case 'R': h++; break; case 'L': h--; break; } } return v == 0 && h == 0; }}

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