commit e4d7afc06a2a8e8c855b71bf1d2900c28e14c18a
Author: Dmitri <dmitri.ollari@protonmail.com>
Date:   Tue Jul 29 14:25:26 2025 +0200

    start

diff --git a/3.longest-substring-without-repeating-characters.ts b/3.longest-substring-without-repeating-characters.ts
new file mode 100644
index 0000000..b5efca2
--- /dev/null
+++ b/3.longest-substring-without-repeating-characters.ts
@@ -0,0 +1,12 @@
+// @leet start
+function lengthOfLongestSubstring(s: string): number {
+	let max = 0;
+
+	s.split("").map((value, index) => {
+		const seenString = new Set();
+		while (true) { }
+	});
+
+	return max;
+}
+// @leet end