2016 Update

Task/Man-or-boy-test/Go/man-or-boy-test-2.go

@@ -3,22 +3,22 @@ package main
 import "fmt"
 
 func A(k int, x1, x2, x3, x4, x5 func() int) (a int) {
-    var B func() int
-    B = func() (b int) {
-        k--
-        a = A(k, B, x1, x2, x3, x4)
-        b = a
-        return
-    }
-    if k <= 0 {
-        a = x4() + x5()
-    } else {
-        B()
-    }
-    return
+	var B func() int
+	B = func() (b int) {
+		k--
+		a = A(k, B, x1, x2, x3, x4)
+		b = a
+		return
+	}
+	if k <= 0 {
+		a = x4() + x5()
+	} else {
+		_ = B()
+	}
+	return
 }
 
 func main() {
-    K := func(x int) func() int { return func() int { return x } }
-    fmt.Println(A(10, K(1), K(-1), K(-1), K(1), K(0)))
+	K := func(x int) func() int { return func() int { return x } }
+	fmt.Println(A(10, K(1), K(-1), K(-1), K(1), K(0)))
 }

Task/Man-or-boy-test/Go/man-or-boy-test-3.go

@@ -0,0 +1,34 @@
+package main
+
+import "fmt"
+
+func eval(v interface{}) int {
+	switch v := v.(type) {
+	case int:
+		return v
+	case func() int:
+		return v()
+	}
+	panic("bad type")
+	return 0
+}
+
+func A(k int, x1, x2, x3, x4, x5 interface{}) (a int) {
+	var B func() int
+	B = func() (b int) {
+		k--
+		a = A(k, B, x1, x2, x3, x4)
+		b = a
+		return
+	}
+	if k <= 0 {
+		a = eval(x4) + eval(x5)
+	} else {
+		_ = B()
+	}
+	return
+}
+
+func main() {
+	fmt.Println(A(10, 1, -1, -1, 1, 0))
+}

Task/Man-or-boy-test/Go/man-or-boy-test-4.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+    "fmt"
+    "math/big"
+)
+
+func A(k int) *big.Int {
+    one := big.NewInt(1)
+    c0 := big.NewInt(3)
+    c1 := big.NewInt(2)
+    c2 := big.NewInt(1)
+    c3 := big.NewInt(0)
+    for j := 5; j < k; j++ {
+        c3.Sub(c3.Add(c3, c0), one)
+        c0.Add(c0, c1)
+        c1.Add(c1, c2)
+        c2.Add(c2, c3)
+    }
+    return c0.Add(c0.Sub(c0.Sub(c0, c1), c2), c3)
+}
+
+func p(k int) {
+    fmt.Printf("A(%d) = ", k)
+    if s := A(k).String(); len(s) < 60 {
+        fmt.Println(s)
+    } else {
+        fmt.Printf("%s...%s (%d digits)\n",
+            s[:6], s[len(s)-5:], len(s)-1)
+    }
+}
+
+func main() {
+    p(10)
+    p(30)
+    p(500)
+    p(10000)
+    p(1e6)
+}