A-M baby

Task/Factorial/Go/factorial-1.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+    "fmt"
+    "math/big"
+)
+
+func main() {
+    fmt.Println(factorial(800))
+}
+
+func factorial(n int64) *big.Int {
+    if n < 0 {
+        return nil
+    }
+    r := big.NewInt(1)
+    var f big.Int
+    for i := int64(2); i <= n; i++ {
+        r.Mul(r, f.SetInt64(i))
+    }
+    return r
+}

Task/Factorial/Go/factorial-2.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+    "math/big"
+    "fmt"
+)
+
+func factorial(n int64) *big.Int {
+    var z big.Int
+    return z.MulRange(1, n)
+}
+
+func main() {
+    fmt.Println(factorial(800))
+}