purchasing max item has been done

Author: gulshanyadav01

Heap/a.out

@@ -0,0 +1,47 @@
+/*
+author:gulshan yadav
+email: gulshany01@gmail.com
+date: 21-July-2021
+*/
+#include<iostream>
+#include<bits/stdc++.h>
+using namespace std;
+
+int purchasingMaxItem(int arr[], int num, int sum){
+    // build the min heap; 
+    priority_queue<int, vector<int>, greater<int>> pq; 
+
+    // push all element into heap; 
+    for(int i = 0; i< num; i++){
+        pq.push(arr[i]); 
+    }
+
+    int res = 0; 
+    while(pq.empty() == false){
+        if(pq.top()<= sum){
+            res++; 
+            sum = sum-pq.top();
+            pq.pop(); 
+        }
+        else{
+            break;
+        }
+    }
+    return res; 
+
+}
+
+int main(){
+    int num; 
+    cin >> num; 
+    int *arr = new int[num];
+    for(int i = 0; i< num; i++){
+        cin >> arr[i]; 
+    }
+    int sum; 
+    cin >> sum; 
+
+    cout << purchasingMaxItem(arr, num, sum);
+    return 0; 
+
+}