Added 1692B - All Distinct.cpp

Author: vikashpatel24

1692B - All Distinct.cpp

@@ -0,0 +1,28 @@
+//                                 ॐ नमः शिवाय
+#include<bits/stdc++.h>
+using namespace std;
+#define ll long long
+ 
+// Code Written By: Vikash Patel
+// Codeforces Profile: https://codeforces.com/profile/vikashpatel
+ 
+int main()
+{
+    int t;
+    cin>>t;
+    while(t--)
+    {
+        int n;
+        cin>>n;
+        int a[n];
+        set<int> st;
+        for(int i=0; i<n; i++)
+        {
+            cin>>a[i];
+            st.insert(a[i]);
+        }
+        int l = st.size();
+        cout<<((n-l)%2==0?l:l-1)<<endl;
+    }
+    return 0;
+}