diff --git a/Crossing_Blocks.cpp b/Crossing_Blocks.cpp
new file mode 100644
index 0000000..7197603
--- /dev/null
+++ b/Crossing_Blocks.cpp
@@ -0,0 +1,46 @@
+#include<bits/stdc++.h>
+using namespace std;
+#define ll long long
+#define rep(i,a,n) for(ll i=a;i<n;i++)
+// by sudhanshu
+void solve()
+{
+   ll n,k;
+   cin>>n;
+   vector<ll> v(n);
+   map<ll,ll> mp;
+   rep(i,0,n)
+    {
+        cin>>v[i];
+        mp[v[i]]++;
+    }
+    vector<ll> v1=v;
+    sort(v1.begin(),v1.end());
+    if(v[0]!=v1[n-1])
+    {
+        cout<<-1<<'\n';
+        return;
+    }
+    ll count=0;
+    ll mx=-1;
+    for(int i=n-1;i>=1;i--)
+    {
+        if(v[i]>mx)
+        {
+            mx=v[i];
+            count++;
+        }
+    }
+    cout<<count<<'\n';
+
+}
+int main() {
+    ll t;
+    cin>>t;
+    while(t--)
+    {
+        solve();
+        
+    }
+    return 0;
+}
\ No newline at end of file