[Add] solved solutions

cpp/FLOW016.cpp

@@ -0,0 +1,28 @@
+#include <iostream>
+
+using namespace std;
+
+unsigned long long int gcd(int a, int b) {
+    unsigned long long int temp;
+    while (b != 0)
+    {
+        temp = a % b;
+        a = b;
+        b = temp;
+    }
+    return a;
+}
+
+int main()
+{
+    unsigned long long int t, a, b, l, g;
+    cin >> t;
+    while (t--)
+    {
+        cin >> a >> b;
+        g = gcd(a, b);
+        l = a*b/g;
+        cout << g << " " << l << endl;
+    }
+    return 0;
+}