67 lines
1.5 KiB
C++
67 lines
1.5 KiB
C++
/**
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* File: heap.cpp
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* Created Time: 2023-01-19
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* Author: LoneRanger(836253168@qq.com)
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*/
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#include "../utils/common.hpp"
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void testPush(priority_queue<int> &heap, int val) {
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heap.push(val); // 元素入堆
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cout << "\n元素 " << val << " 入堆后" << endl;
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printHeap(heap);
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}
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void testPop(priority_queue<int> &heap) {
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int val = heap.top();
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heap.pop();
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cout << "\n堆顶元素 " << val << " 出堆后" << endl;
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printHeap(heap);
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}
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/* Driver Code */
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int main() {
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/* 初始化堆 */
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// 初始化小顶堆
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// priority_queue<int, vector<int>, greater<int>> minHeap;
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// 初始化大顶堆
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priority_queue<int, vector<int>, less<int>> maxHeap;
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cout << "\n以下测试样例为大顶堆" << endl;
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/* 元素入堆 */
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testPush(maxHeap, 1);
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testPush(maxHeap, 3);
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testPush(maxHeap, 2);
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testPush(maxHeap, 5);
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testPush(maxHeap, 4);
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/* 获取堆顶元素 */
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int peek = maxHeap.top();
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cout << "\n堆顶元素为 " << peek << endl;
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/* 堆顶元素出堆 */
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testPop(maxHeap);
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testPop(maxHeap);
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testPop(maxHeap);
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testPop(maxHeap);
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testPop(maxHeap);
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/* 获取堆大小 */
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int size = maxHeap.size();
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cout << "\n堆元素数量为 " << size << endl;
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/* 判断堆是否为空 */
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bool isEmpty = maxHeap.empty();
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cout << "\n堆是否为空 " << isEmpty << endl;
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/* 输入列表并建堆 */
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// 时间复杂度为 O(n) ，而非 O(nlogn)
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vector<int> input{1, 3, 2, 5, 4};
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priority_queue<int, vector<int>, greater<int>> minHeap(input.begin(), input.end());
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cout << "输入列表并建立小顶堆后" << endl;
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printHeap(minHeap);
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return 0;
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}
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