add: 最长无重复字符的子串

src/string/longest-substring-without-repeating-characters.js

@@ -0,0 +1,15 @@
+/**
+ * @param {string} s
+ * @return {number}
+ */
+export const lengthOfLongestSubstring = function (s) {
+  let max = 0
+
+  for (let n = 0, len = s.length, inx = 0, set = new Set(); n < len; n++) {
+    if (n !== 0) set.delete(s[n - 1])
+    while (inx < len && !set.has(s[inx])) set.add(s[inx++])
+    max = Math.max(max, inx - n)
+  }
+
+  return max
+}