2024每日刷题（179）

Leetcode—1114. 按序打印

C++实现代码

class Foo {
public:
    Foo() {
        firstMutex.lock();
        secondMutex.lock();
    }

    void first(function<void()> printFirst) {
        
        // printFirst() outputs "first". Do not change or remove this line.
        printFirst();
        firstMutex.unlock();
    }

    void second(function<void()> printSecond) {
        
        // printSecond() outputs "second". Do not change or remove this line.
        firstMutex.lock();
        printSecond();
        secondMutex.unlock();
    }

    void third(function<void()> printThird) {
        
        // printThird() outputs "third". Do not change or remove this line.
        secondMutex.lock();
        printThird();
    }
private:
    mutex firstMutex;
    mutex secondMutex;
};

运行结果

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