Added 1367B - Even Array.cpp

Author: vikashpatel24

1367B - Even Array.cpp

@@ -0,0 +1,37 @@
+//                                 ॐ नमः शिवाय
+#include<bits/stdc++.h>
+using namespace std;
+
+// 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];
+        for(int i=0; i<n; i++)
+        {
+            cin>>a[i];
+        }
+        int od = 0, ev = 0;
+        for(int i=0; i<n; i++)
+        {
+            if(i%2 != a[i]%2)
+            {
+                if(a[i]%2 == 1)
+                od++;
+                else 
+                ev++;
+            }
+        }
+        if(od == ev)
+        cout<<od<<endl;
+        else
+        cout<<-1<<endl;
+    }
+}