From c0974d3107ffc7cba16f93518b9bece3747d2e69 Mon Sep 17 00:00:00 2001
From: takkarparas <41841853+takkarparas@users.noreply.github.com>
Date: Fri, 30 Oct 2020 22:39:57 +0530
Subject: [PATCH] Create evenarray.cpp

---
 Algorithm/evenarray.cpp | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 Algorithm/evenarray.cpp

diff --git a/Algorithm/evenarray.cpp b/Algorithm/evenarray.cpp
new file mode 100644
index 0000000..2344db5
--- /dev/null
+++ b/Algorithm/evenarray.cpp
@@ -0,0 +1,27 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+int t,s,e,i;
+vector<int>v;
+int main()
+{   cin>>t;
+    while(t--)
+    {   
+        int a=0;
+        int b=0;
+        cin>>s;
+        for(i=0;i<s;i++)
+        {
+            cin>>e;
+
+            if((e%2)==0&(i%2)!=0)
+            {a+=1;}
+            if((e%2)!=0&(i%2)==0)
+            {b+=1;}
+        }
+        if(a==b)
+        {cout<<a<<"\n";}
+        else
+        {cout<<-1<<"\n";}
+    }
+}