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Solve Codeforces 1791C – “Prepend and Append” in under a minute! 🚀
In this C++ walkthrough, I use strings + two-pointer logic inside a while loop to shrink the string from both ends until characters match, then output the remaining length. Clean, fast, and O(n).

What you’ll learn

Problem idea: remove mismatched ends until s[l] == s[r]

Two-pointer technique on a string

Simple while loop implementation in C++

Time complexity: O(n), space: O(1)

Keywords
Codeforces 1791C, Prepend and Append, C++ solution, two pointer approach, string problem, while loop, competitive programming, CP tutorial, O(n) solution

Call to action
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Hashtags
#Codeforces #1791C #PrependAndAppend #CPP #TwoPointers #Strings #CompetitiveProgramming #CodingInterview #Algorithm #DSA