Create Not Adding.cpp

Author: MathProgrammer

2022/Contests/Div 2/766/Programs/Not Adding.cpp

@@ -0,0 +1,52 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+#include <map>
+
+using namespace std;
+
+int main()
+{
+    int no_of_elements;
+    cin >> no_of_elements;
+
+    vector <int> A(no_of_elements + 1);
+    for(int i = 1; i <= no_of_elements; i++)
+    {
+        cin >> A[i];
+    }
+
+    const int MAX_N = 1e6 + 5;
+    vector <int> is_present(MAX_N, false);
+    for(int i = 1; i <= no_of_elements; i++)
+    {
+        is_present[A[i]] = true;
+    }
+
+    vector <int> multiple_gcd(MAX_N, 0);
+    for(int i = 1; i < MAX_N; i++)
+    {
+        for(int multiple = i; multiple < MAX_N; multiple += i)
+        {
+            if(is_present[multiple])
+            {
+                multiple_gcd[i] = __gcd(multiple_gcd[i], multiple);
+            }
+        }
+    }
+
+    int new_elements = 0;
+    for(int i = 1; i < MAX_N; i++)
+    {
+        if(!is_present[i] && multiple_gcd[i] == i)
+        {
+            new_elements++;
+        }
+    }
+
+    cout << new_elements << "\n";
+    return 0;
+}
+
+
+