解法

bool judgeCircle(string moves) {
    int x = 0, y = 0;

    for(int i = 0; i < moves.length(); i++)
    {
        switch (moves[i])
        {
        case 'U':
            y++;
            break;
        case 'D':
            y--;
            break;
        case 'L':
            x++;
            break
 
;
        case 'R':
            x--;
            break;
        default:
            break;
        }
    }

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

    return false;
}