Update links.txt

encrypted-def · web-flow · commit 0aa26dd69561 · 2024-11-02T21:40:32.000+09:00
diff --git a/workbook/links.txt b/workbook/links.txt
@@ -33,3 +33,4 @@
 Appendix A,문자열 기초,https://www.acmicpc.net/workbook/view/14409
 Appendix B,동적 배열 (문제집 X)
 Appendix C,비트마스킹,https://www.acmicpc.net/workbook/view/18875
+Appendix D,Union-Find,https://www.acmicpc.net/workbook/view/21218
