Added new question in Array section

Learning C++ with DSA/4. Arrays/Questions/12. Frequencies in A Sorted Array/code.cpp

@@ -0,0 +1,35 @@
+#include <bits/stdc++.h>
+using namespace std;
+#define ll long long
+#define db double
+#define ld long double
+#define el "\n"
+
+//Time Complexity: O(N)
+void solution(){
+  int n = 6;
+  int a[n] = {10, 10, 10, 25, 30, 30};
+
+  int ans = 1;
+  for (int i = 1; i < n; i++){
+    if(a[i] == a[i-1]){
+      ans++;
+    }else{
+      cout << a[i-1] << " - " << ans << el;
+      ans = 1;
+    }
+  }
+  cout << a[n-1] << " - " << ans << el;
+}
+
+int main(){
+  ios_base::sync_with_stdio(false);
+  cin.tie(NULL);
+
+  int t;
+  cin >> t;
+  while (t--)
+    solution();
+
+  return 0;
+}