filenames and namespace fixes

others/GCD_of_n_numbers.cpp

@@ -5,7 +5,7 @@ int main() {
     int n;
     std::cout << "Enter value of n:" << std::endl;
     std::cin >> n;
-    int a[n];
+    int *a = new int[n];
     int i, j, gcd;
     std::cout << "Enter the n numbers:" << std::endl;
     for (i = 0; i < n; i++) std::cin >> a[i];
@@ -18,5 +18,6 @@ int main() {
             gcd = a[j] % gcd;  // calculating GCD by division method
     }
     std::cout << "GCD of entered n numbers:" << gcd;
+    delete[] a;
     return 0;
 }

others/fibonacci_fast.cpp

@@ -9,7 +9,6 @@
 
 #include <cstdio>
 #include <iostream>
-using namespace std;
 
 const long long MAX = 93;
 
@@ -31,7 +30,7 @@ long long fib(long long n) {
 int main() {
     // Main Function
     for (long long i = 1; i < 93; i++) {
-        cout << i << " th fibonacci number is " << fib(i) << "\n";
+        std::cout << i << " th fibonacci number is " << fib(i) << "\n";
     }
     return 0;
 }