Merge pull request #2017 from AlgorithmWithGod/JHLEE325

[20260312] BOJ / G5 / 수 이어 쓰기 2 / 이준희

Author: ShinHeeEul

JHLEE325/202603/12 BOJ G5 수 이어 쓰기 2.md

@@ -0,0 +1,34 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        long N = Long.parseLong(st.nextToken());
+        long K = Long.parseLong(st.nextToken());
+
+        long len = 1;
+        long count = 9;
+        long num = 0;
+
+        while (K > len * count) {
+            K -= (len * count);
+            len++;
+            count *= 10;
+        }
+
+        num = (long)Math.pow(10, len - 1) + (K - 1) / len;
+
+        if (num > N) {
+            System.out.println("-1");
+        } else {
+            String s = String.valueOf(num);
+            System.out.println(s.charAt((int)((K - 1) % len)));
+        }
+    }
+}
+```