Create 793-preimage-size-of-factorial-zeroes-function.js

Author: everthis

793-preimage-size-of-factorial-zeroes-function.js

@@ -0,0 +1,14 @@
+/**
+ * @param {number} K
+ * @return {number}
+ */
+const preimageSizeFZF = function(K) {
+  let last = 1
+  while (last < K) last = last * 5 + 1
+  while (last > 1) {
+    K %= last
+    if (last - 1 == K) return 0
+    last = ((last - 1) / 5) >> 0
+  }
+  return 5
+}