Initial commit

P4/PriorityQueue.h

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+#ifndef PRIORITYQUEUE_H
+#define PRIORITYQUEUE_H
+
+#include <iostream>
+#include <vector>
+#include <tuple>
+
+class PriorityQueue
+{
+public:
+    PriorityQueue(int maxCount);
+    void Init(std::vector<std::tuple<int, int, int>> *vertexList);
+    std::tuple<int, int, int> HeapExtractMin();
+    bool Modify(int i, int w, int parent);
+    bool Contains(int v);
+    bool IsEmpty();
+    int GetKey(int v);
+
+private:
+    int count;
+    void Exchange(int a, int b);
+    void MinHeapify(int i);
+    int Parent(int i);
+    int Left(int i);
+    int Right(int i);
+    std::vector<std::tuple<int, int, int>> arr; // The actual priority queue.
+    std::vector<int> locations;                 // References for vertex -> PQ index. Allows indexing PQ in O(1) time.
+    const int MAX_UNIQUE_KEYS = 50001;
+};
+
+#endif