Added CSES problem in z-function.md

Nafyaz · web-flow · commit 5f025c84cadf · 2025-08-24T01:23:53.000+06:00
diff --git a/src/string/z-function.md b/src/string/z-function.md
@@ -203,7 +203,7 @@ A solution is: compute the Z-function of $s$, loop through all $i$ such that $i$
 The proof for this fact is the same as the solution which uses the [prefix function](prefix-function.md).
 
 ## Practice Problems
-
+* [CSES - Finding Borders](https://cses.fi/problemset/task/1732)
 * [eolymp - Blocks of string](https://www.eolymp.com/en/problems/1309)
 * [Codeforces - Password [Difficulty: Easy]](http://codeforces.com/problemset/problem/126/B)
 * [UVA # 455 "Periodic Strings" [Difficulty: Medium]](http://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=396)
