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;
    }
}