diff --git a/codeforcesD.cpp b/codeforcesD.cpp
new file mode 100644
index 0000000..f1046d7
--- /dev/null
+++ b/codeforcesD.cpp
@@ -0,0 +1,59 @@
+#include <bits/stdc++.h>
+using namespace std;
+typedef long long int ll;
+
+void solve(){
+    int n;
+    cin >> n;
+
+    vector<int> spend(n);
+    vector<int> budget(n);
+    // int a;
+
+    for(int i = 0; i < n; i++){
+        cin >> spend[i];
+    }
+
+    for(int i = 0; i < n; i++){
+        cin >> budget[i];
+    }
+
+    vector<int> surplus;
+    for(int i = 0; i < n; i++){
+        surplus.push_back(budget[i]-spend[i]);
+    }
+
+    sort(surplus.begin(), surplus.end());
+
+    int i = 0;
+    int j = n-1;
+
+    int grp = 0;
+
+    while(i < j){
+        if(surplus[j] + surplus[i] >= 0){
+            grp++;
+            i++;
+            j--;
+        }
+        else{
+            i++;
+        }
+    }
+
+    cout << grp << endl;
+}
+
+int main(){
+// #ifndef MYNK
+//     freopen("input.txt", "r", stdin);
+//     freopen("output.txt", "w", stdout);
+// #endif
+    int t;
+    cin >> t;
+    while(t--){
+        solve();
+    }
+
+    return 0;
+}