326-e-Power of Three

本文介绍了两种判断一个整数是否为3的幂的方法:一种是通过循环不断除以3来验证;另一种则是利用对数函数计算该数的以3为底的对数值,若结果为整数则说明该数是3的幂。

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判断一个数是否是3的幂。

求幂的不用想leet的规矩肯定要将除数自增的不然可能会超时。于是抄手就写oc了,看到题目竟然有要求可以不用循环,得网搜去吧,原来是用了log函数,这还真是没想到,也把代码贴上来做个记录吧。

循环逻辑的:

bool isPowerOfThree(int n) {
    if (n <= 0)
        return false;
        
    bool result = true;
    
    int p = 3;
    while (n > 1) {
        if (n < p) p = 3;
        if (n % p == 0) {
            n /= p;
            p *= 3;
        }
        else {
            result = false;
            break;
        }
    }
    
    return result;
}

对数逻辑的:

bool isPowerOfThree(int n) {
        double logAns = log10(n) / log10(3);
        return (logAns - int(logAns) == 0) ? true : false;
    }


### E-bike Electrical Schematic Diagram E-bikes, or electric bikes, integrate mechanical and electrical components to provide assisted pedaling. The core elements of an e-bike's electrical system include the battery, controller, motor, display unit, sensors (such as pedal assist sensors), and wiring harnesses[^1]. Below is a detailed breakdown of these components: #### Battery The battery serves as the power source for all electrical systems on the e-bike. Lithium-ion batteries are commonly used due to their high energy density and lightweight properties[^2]. These batteries connect directly to the controller via specific voltage lines. #### Controller The controller acts as the brain of the e-bike’s electrical system. It regulates the flow of electricity from the battery to the motor based on input signals received from various sensors like throttle controls or cadence/ torque sensors[^3]. #### Motor Electric motors convert electrical energy into mechanical motion that propels the bike forward. Hub motors (front or rear wheel mounted) and mid-drive motors are two common types found in modern e-bikes[^4]. Motors receive current instructions through three-phase wires connected back to the controller. #### Display Unit & Sensors A user interface typically includes LED displays showing speed, distance traveled, remaining charge levels etc., while integrated sensors monitor rider inputs such as crank rotation frequency or applied force during pedaling activities[^5]. Here follows a simplified example layout representing how different parts might be interconnected within typical ebike schematics using pseudo-code representation instead actual circuit diagrams because textual medium limitations here do not allow graphical depictions : ```plaintext +-------------------+ | BATTERY | +---------+--------+ | Voltage Line +-----v------+ | CONTROLLER |---> Signal Wire --> SENSOR(S) +-----+------+ | Phase Wires +-----v------+ | MOTOR | +------------+ ``` This structure outlines basic connections but does vary significantly depending upon manufacturer specifications along with additional safety features incorporated by some brands which may add fuses , MOSFETs among other protective devices ensuring reliable operation under varying conditions .
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