From 1ac61b1a2143855ca4885871db4dbd0dcd548cc3 Mon Sep 17 00:00:00 2001
From: Matej Focko <me@mfocko.xyz>
Date: Sun, 22 Sep 2024 22:14:01 +0200
Subject: [PATCH] =?UTF-8?q?java:=20add=20=C2=AB440.=20K-th=20Smallest=20in?=
 =?UTF-8?q?=20Lexicographical=20Order=C2=BB?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Matej Focko <me@mfocko.xyz>
---
 ...-th-smallest-in-lexicographical-order.java | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 java/k-th-smallest-in-lexicographical-order.java

diff --git a/java/k-th-smallest-in-lexicographical-order.java b/java/k-th-smallest-in-lexicographical-order.java
new file mode 100644
index 0000000..97431e4
--- /dev/null
+++ b/java/k-th-smallest-in-lexicographical-order.java
@@ -0,0 +1,31 @@
+class Solution {
+  private int distance(int upperBound, long left, long right) {
+    var dist = 0;
+
+    for (; left <= upperBound; left *= 10, right *= 10) {
+      dist += Math.min(upperBound + 1, right) - left;
+    }
+
+    return dist;
+  }
+
+  public int findKthNumber(int n, int k) {
+    var current = 1;
+    --k;
+
+    while (k > 0) {
+      var d = distance(n, current, current + 1);
+
+      if (d <= k) {
+        // skipping d numbers at once
+        ++current;
+        k -= d;
+      } else {
+        current *= 10;
+        --k;
+      }
+    }
+
+    return current;
+  }
+}