From 1329d518f1c30c5093fec173ca9efb09cd8f82ab Mon Sep 17 00:00:00 2001
From: chayan das <110921638+Chayandas07@users.noreply.github.com>
Date: Sun, 22 Sep 2024 23:08:58 +0530
Subject: [PATCH] Create 440. K-th Smallest in Lexicographical Order1

---
 440. K-th Smallest in Lexicographical Order1 | 28 ++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 440. K-th Smallest in Lexicographical Order1

diff --git a/440. K-th Smallest in Lexicographical Order1 b/440. K-th Smallest in Lexicographical Order1
new file mode 100644
index 0000000..0440b5c
--- /dev/null
+++ b/440. K-th Smallest in Lexicographical Order1	
@@ -0,0 +1,28 @@
+class Solution {
+public:
+    long countSteps(long prefix, long n) {
+        long steps = 0, nextPrefix = prefix + 1;
+        while (prefix <= n) {
+            steps += min(n + 1, nextPrefix) - prefix;
+            prefix *= 10;
+            nextPrefix *= 10;
+        }
+        return steps;
+    }
+
+    int findKthNumber(int n, int k) {
+        int curr = 1;
+        k--;
+        while (k > 0) {
+            long steps = countSteps(curr, n);
+            if (steps <= k) {
+                curr++;
+                k -= steps;
+            } else {
+                curr *= 10;
+                k--;
+            }
+        }
+        return curr;
+    }
+};