heap

问题 Every time when I initiate a list in java, I will do List<Integer> list = new LinkedList<>(); I assume that this will allocate the list on heap. Wonder if there's anyway that I could allocate the list on stack? 回答1: All objects, including their individual attributes, are stored on the heap. All local variables, and their arguments, are stored on the stack because they contain primitive values or references. However, in special cases, the java virtual machine may perform escape analysis and

问题 In CLRS, third Edition, on page 155, it is given that in MAX-HEAPIFY, "the worst case occurs when the bottom level of the tree is exactly half full" I guess the reason is that in this case, Max-Heapify has to "float down" through the left subtree. But the thing I couldn't get is "why half full" ? Max-Heapify can also float down if left subtree has only one leaf. So why not consider this as the worst case ? 回答1: Read the entire context: The children's subtrees each have size at most 2n/3 - the

问题 In CLRS, third Edition, on page 155, it is given that in MAX-HEAPIFY, "the worst case occurs when the bottom level of the tree is exactly half full" I guess the reason is that in this case, Max-Heapify has to "float down" through the left subtree. But the thing I couldn't get is "why half full" ? Max-Heapify can also float down if left subtree has only one leaf. So why not consider this as the worst case ? 回答1: Read the entire context: The children's subtrees each have size at most 2n/3 - the

问题 I have a similar question as before in boost::interprocess Containers of containers NOT in shared memory and How to I create a boost interprocess vector of interprocess containers but this time I like to use my class, which uses a scoped_allocator, also on the heap and shared memory. The solution to my first question was to use a template class with an allocator type In my second previous question it turned out that using a scoped_allocator together with a container of containers within the

问题 I have a similar question as before in boost::interprocess Containers of containers NOT in shared memory and How to I create a boost interprocess vector of interprocess containers but this time I like to use my class, which uses a scoped_allocator, also on the heap and shared memory. The solution to my first question was to use a template class with an allocator type In my second previous question it turned out that using a scoped_allocator together with a container of containers within the

问题 I have a similar question as before in boost::interprocess Containers of containers NOT in shared memory and How to I create a boost interprocess vector of interprocess containers but this time I like to use my class, which uses a scoped_allocator, also on the heap and shared memory. The solution to my first question was to use a template class with an allocator type In my second previous question it turned out that using a scoped_allocator together with a container of containers within the

问题 Can anyone tell me why Iam running off heap space when I try to run this code on a list of 2000 elements? public static <T extends Comparable <? super T>> void insertionSort2(List<T> portion){ int i = 0; int j = 0; T value; //List <T> sorted = new LinkedList<T>(); // goes through the list for (i = 1; i < portion.size(); i++) { // takes each value of the list value = (T) portion.remove(i); // the index j takes the value of I and checks the rest of the array // from the point i j = i - 1; while

问题 Can anyone tell me why Iam running off heap space when I try to run this code on a list of 2000 elements? public static <T extends Comparable <? super T>> void insertionSort2(List<T> portion){ int i = 0; int j = 0; T value; //List <T> sorted = new LinkedList<T>(); // goes through the list for (i = 1; i < portion.size(); i++) { // takes each value of the list value = (T) portion.remove(i); // the index j takes the value of I and checks the rest of the array // from the point i j = i - 1; while

问题 I have written some class that moves heap allocated stuff to stack (hopefully :) ). This calss is singleton because only this class should be responsible for holding and managing part of stack. My question is: Is my code correct? Code is correct in the sense of programming (no compile errors, no memory errors and leaks (checked by valgrind)). But does the code really moves heap to stack? Here's the code: stack.hpp: class CStack{ public: void* getAlloc(long); static CStack* Instance(); private

问题 I'm trying to create a sort function in c++ that sorts a linked list object using Heap sort but I'm not sure how to get started. Can anyone give me any idea on how to do it ? I'm not even sure how I would sort a Linked List 回答1: Heapsort works by building a heap out of the data. A heap is only efficient to build when you have random-access to each element. The first step is going to be creating an array of pointers to your list objects, so you can perform the usual heap sort on the array. The