利用这一性质,我们可以声明一个大小为 k 的小根堆,然后首先将 (i,0) 全部放入堆中,之后每次取出一个元素 (i,j),就将候补的 (i,j+1) 放入堆中,直到取够 k 个元素。 参考cppreference.com,我们给出 lambda 表达式来初始化 comparator 的写法。 返回顶部 参考代码 注意第三个参数需要 decltype(cmp),以及...
C++ priority_queue 头文件 #include<queue> 自定义比较函数 lambda (c++11) 注意使用关键字decltype autocomp=[origin](Point a,Point b){autoaDis=distanceSquare(a,origin);autobDis=distanceSquare(b,origin);if(aDis==bDis){if(a.x==b.x){returna.y<b.y;}else{returna.x<b.x;}}else{returnaDi...
);// Using lambda to compare elements.autocmp=[](intleft,intright){return(left^1)<(right^1);};std::priority_queue<int,std::vector<int>, decltype(cmp)>lambda_priority_queue(cmp);for(intn:data)lambda_priority_queue.push(n);pop_println("lambda_priority_queue", lambda_priority_queue);...
Use the Custom Comparator to Specify the Element Ordering in C++ At first, we define avectorof strings used to initialize apriority_queue. Next, a lambda expression is defined to form the comparator function. The latter compares two strings by length. Now, we can declare apriority_queueobject...
publicstaticvoidmain(String[]args){// 创建优先级队列,指定队列初始大小 指定队列中的任务比较器// 优先级队列是无界的 指定的只是初始大小// 可以使用lambda简化PriorityBlockingQueue queue=newPriorityBlockingQueue(100,newComparator<TestRunnable>(){@Overridepublicintcompare(TestRunnable o1,TestRunnable o2){retu...
2.2. PriorityBlockingQueue Comparator example Let’s redefine the custom ordering usingJava 8 lambda based comparatorsyntax and verify the result. We are using constructorPriorityBlockingQueue(int initialCapacity, Comparator comparator). //Comparator for name field ...
只不过使用Lambda表达式更加优雅// 如果只是想实现降序或者升序,可以使用Comparator.reverseOrder()或Comparator.naturalOrder()PriorityBlockingQueue<Integer>priorityBlockingQueue=newPriorityBlockingQueue(20,Comparator.naturalOrder());priorityBlockingQueue.add(6);priorityBlockingQueue.add(10);priorityBlockingQueue.add(2...