Create Priority Queue.cpp

CPP/Priority Queue.cpp

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+#include<iostream>
+#include<vector>
+#include<queue>
+using namespace std;
+
+int main()
+{
+    {
+        priority_queue<int> q;
+        for(int elm: {1,8,5,6,3,4})
+            q.push(elm);
+        while(!q.empty()){
+            cout<<q.top()<<" ";
+            q.pop();
+        }
+        cout<<endl;
+    }
+    {
+        priority_queue<int, vector<int>, greater<int>> q2;
+        for(int elm: {1,8,5,6,3,4})
+            q2.push(elm);
+        while(!q2.empty()){
+            cout<<q2.top()<<" ";
+            q2.pop();
+        }
+        cout<<endl;
+    }
+    {
+        auto cmp=[] (int left, int right) { return(left) < (right);};
+        priority_queue<int, vector<int>, decltype(cmp)> q3(cmp);
+        for(int elm: {1,8,5,6,3,4})
+            q3.push(elm);
+        while(!q3.empty()){
+            cout<<q3.top()<<" ";
+            q3.pop();
+        }
+        cout<<endl;
+    }
+}