diff --git a/codechef/KS1.cpp b/codechef/KS1.cpp
new file mode 100644
index 0000000..abcebc4
--- /dev/null
+++ b/codechef/KS1.cpp
@@ -0,0 +1,70 @@
+#include <bits/stdc++.h>
+using namespace std;
+#define ll long long int
+#define fastIO ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
+#define deb(x) cout<<#x<<" "<<x<<endl
+int main()
+{
+    fastIO;
+    int t;
+    cin>>t;
+    while(t--)
+    {
+    ll n,c=0;
+    cin>>n;
+    ll a[n];
+    unordered_map<ll,vector<ll> > mp;
+    unordered_map<ll,ll> b;
+    for(ll i=0;i<n;i++)
+        cin>>a[i];
+    mp[a[0]].push_back(0);
+    ll x=a[0];
+    b[x]++;
+    for(ll i=1;i<n;i++)
+     {
+         x=x^a[i];
+         //deb(x);
+
+         b[x]++;
+         mp[x].push_back(i);
+         if(x==0)
+            c+=i;
+     }
+     for(auto it=b.begin();it!=b.end();it++)
+     {
+          //if(it->second>1)
+          //{
+          ll y=it->first;
+         // deb(y);
+         ll s=mp[y].size();
+         //deb(s);
+          for(auto p=0;p<s-1;p++)
+          {
+             ll z=mp[y][p+1]-mp[y][p]-1;
+             //deb(z);
+             c+=(s-p-1)*z*(p+1);
+          }
+
+          if(s-1>1)
+          {
+              ll y=((s-2)*(s-1)*s)/6;
+              c+=y;
+          }
+         // }
+     }
+    cout<<c<<endl;
+    b.clear();
+    mp.clear();
+    }
+    return 0;
+ }
+
+
+
+
+
+
+
+
+
+