657. 机器人能否返回原点

class Solution {
public:
    bool judgeCircle(string moves) {
        int x = 0, y = 0;
        for(int i = 0; i < moves.size(); i ++) {
            if(moves[i] == 'U') y ++;
            if(moves[i] == 'D') y --;
            if(moves[i] == 'L') x --;
            if(moves[i] == 'R') x ++;
        }

        if(x == 0 && y == 0) return true;
        return false;
    }
};