fix: Remove repeated algorithm (#1067)

* Improve code and add support for 46+ fibb numbers

* Docs: Fibbonacci docs added

* fix: Add c++ suggested code

* fix: remove repeated algorithm

dynamic_programming/fibonacci_top_down.cpp

@@ -1,22 +0,0 @@
-#include <iostream>
-using namespace std;
-int arr[1000000];
-int fib(int n) {
-    if (arr[n] == -1) {
-        if (n <= 1)
-            arr[n] = n;
-        else
-            arr[n] = fib(n - 1) + fib(n - 2);
-    }
-    return arr[n];
-}
-int main(int argc, char const *argv[]) {
-    int n;
-    cout << "Enter n: ";
-    cin >> n;
-    for (int i = 0; i < n + 1; ++i) {
-        arr[i] = -1;
-    }
-    cout << "Fibonacci number is " << fib(n) << endl;
-    return 0;
-}