Data commit

Task/Munchausen-numbers/Go/munchausen-numbers.go

@@ -0,0 +1,36 @@
+package main
+
+import(
+    "fmt"
+    "math"
+)
+
+var powers [10]int
+
+func isMunchausen(n int) bool {
+    if n < 0 { return false }
+    n64 := int64(n)
+    nn  := n64
+    var sum int64 = 0
+    for nn > 0 {
+        sum += int64(powers[nn % 10])
+        if sum > n64 { return false }
+        nn /= 10
+    }
+    return sum == n64
+}
+
+func main() {
+    // cache n ^ n for n in 0..9, defining 0 ^ 0 = 0 for this purpose
+    for i := 1; i <= 9; i++ {
+        d := float64(i)
+        powers[i] = int(math.Pow(d, d))
+    }
+
+    // check numbers 0 to 500 million
+    fmt.Println("The Munchausen numbers between 0 and 500 million are:")
+    for i := 0; i <= 500000000; i++ {
+        if isMunchausen(i) { fmt.Printf("%d ", i) }
+    }
+    fmt.Println()
+}