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Author: shraddhamishra611

DSA 450 GFG/Union_Arrays.cpp

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+#include <bits/stdc++.h>
+using namespace std;
+
+class Solution{
+    public:
+    //Function to return the count of number of elements in union of two arrays.
+    int doUnion(int a[], int n, int b[], int m)  {
+        set<int>s;
+        for (int i = 0; i < n; i++)
+        s.insert(a[i]);
+        
+        for (int i = 0; i < m; i++)
+        s.insert(b[i]);			//duplicates will not be added, property of sets
+        
+        return s.size();
+    }
+};
+
+
+int main() {
+	//enter number of test cases.
+	int t;
+	cin >> t;
+	
+	while(t--){
+	    
+	    int n, m;
+	    //accept size of both the arrays
+	    cin >> n >> m;
+	    int a[n], b[m];
+	   
+	   //accept the arrays
+	    for(int i = 0;i<n;i++)
+	       cin >> a[i];
+	       
+	    for(int i = 0;i<m;i++)
+	       cin >> b[i];
+	       
+	    Solution ob;
+	    cout << ob.doUnion(a, n, b, m) << endl;       //count is displayed
+	    
+	}
+	
+	return 0;
+}