Data commit

Task/Superpermutation-minimisation/Go/superpermutation-minimisation.go

@@ -0,0 +1,62 @@
+package main
+
+import "fmt"
+
+const max = 12
+
+var (
+    super []byte
+    pos   int
+    cnt   [max]int
+)
+
+// 1! + 2! + ... + n!
+func factSum(n int) int {
+    s := 0
+    for x, f := 0, 1; x < n; {
+        x++
+        f *= x
+        s += f
+    }
+    return s
+}
+
+func r(n int) bool {
+    if n == 0 {
+        return false
+    }
+    c := super[pos-n]
+    cnt[n]--
+    if cnt[n] == 0 {
+        cnt[n] = n
+        if !r(n - 1) {
+            return false
+        }
+    }
+    super[pos] = c
+    pos++
+    return true
+}
+
+func superperm(n int) {
+    pos = n
+    le := factSum(n)
+    super = make([]byte, le)
+    for i := 0; i <= n; i++ {
+        cnt[i] = i
+    }
+    for i := 1; i <= n; i++ {
+        super[i-1] = byte(i) + '0'
+    }
+
+    for r(n) {
+    }
+}
+
+func main() {
+    for n := 0; n < max; n++ {
+        fmt.Printf("superperm(%2d) ", n)
+        superperm(n)
+        fmt.Printf("len = %d\n", len(super))
+    }
+}