68 lines
2.6 KiB
C++
68 lines
2.6 KiB
C++
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bool compare_min(unsigned int a, unsigned int b) {
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return a > b;
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}
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bool compare_max(unsigned int a, unsigned int b) {
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return a < b;
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}
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template <class order_by_template_type>
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fast_priority_queue<order_by_template_type>::fast_priority_queue(unsigned int queue_size) {
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this->queue_size = queue_size;
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internal_list.reserve(queue_size);
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}
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template <class order_by_template_type>
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void fast_priority_queue<order_by_template_type>::insert(order_by_template_type main_value, int data) {
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// Because it's ehap we can remove
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// Append new element to the end of list
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internal_list.push_back(main_value);
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// Convert list to the complete heap
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// Up to logarithmic in the distance between first and last: Compares elements and potentially swaps (or moves) them until rearranged as a longer heap.
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std::push_heap (internal_list.begin(), internal_list.end(), compare_min);
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if (this->internal_list.size() >= queue_size) {
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// And now we should remove minimal element from the internal_list
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// Prepare heap to remove min element
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std::pop_heap (internal_list.begin(), internal_list.end(), compare_min);
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// Remove element from the head
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internal_list.pop_back();
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}
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}
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template <class order_by_template_type>
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order_by_template_type fast_priority_queue<order_by_template_type>::get_min_element() {
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// We will return head of list because it's consists minimum element
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return internal_list.front();
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}
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template <class order_by_template_type>
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void fast_priority_queue<order_by_template_type>::print_internal_list() {
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for (unsigned int i = 0; i < internal_list.size(); i++) {
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std::cout<<internal_list[i]<<std::endl;
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}
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}
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template <class order_by_template_type>
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void fast_priority_queue<order_by_template_type>::print() {
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// Create new list for sort because we can't do it in place
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std::vector <order_by_template_type> sorted_list;
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// Allocate enough space
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sorted_list.reserve(internal_list.size());
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// Copy to new vector with copy constructor
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sorted_list = internal_list;
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// Execute heap sort because array paritally sorted already
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std::sort_heap (sorted_list.begin(), sorted_list.end(), compare_min);
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for (unsigned int i = 0; i < sorted_list.size(); i++) {
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std::cout<<sorted_list[i]<<std::endl;
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}
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}
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