https://algorithmsin60days.com/tags/pattern-matching/Recent content in Pattern-Matching on Algorithms in 60 DaysHugoen-usFri, 10 Jul 2026 00:00:00 +0000https://algorithmsin60days.com/topics/strings/Fri, 10 Jul 2026 00:00:00 +0000https://algorithmsin60days.com/topics/strings/<p>A string is a sequence of characters, and for algorithmic purposes it behaves much like an array with one crucial twist: in most languages, including Python, strings are immutable. You cannot change a character in place; every &ldquo;edit&rdquo; builds a new string. That immutability quietly turns naive concatenation loops into O(n^2) traps and shapes how you should manipulate strings efficiently.</p> <h2 id="why-strings-matter">Why Strings Matter<a class="header-anchor" href="#why-strings-matter" aria-label="Permalink to this heading">#</a></h2> <p>String questions are interview staples because they combine array techniques (two pointers, sliding windows) with text-specific ideas (character counting, pattern matching, prefix functions). Palindrome checks, anagram grouping, longest-substring-without-repeats, and substring search all show up regularly. They also test attention to detail: off-by-one errors and Unicode assumptions surface fast.</p>