Robina Li

Suppose you are at a party with n people (labeled from 0 to n - 1) and among them, there may exist one celebrity. The definition of a celebrity is...

There are n buildings in a line. You are given an integer array heights of size n that represents the heights of the buildings in the line.

You are given the root of a binary tree containing digits from 0 to 9 only.

You are given a string s and an integer k, a k duplicate removal consists of choosing k adjacent and equal letters from s and removing them, causing the left...

Given a robot cleaner in a room modeled as a grid.

Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring.

Given the root node of a binary search tree and two integers low and high, return the sum of values of all nodes with a value in the inclusive range...

A string can be abbreviated by replacing any number of non-adjacent, non-empty substrings with their lengths. The lengths should not have leading zeros.

You are given a string s consisting of lowercase English letters. A duplicate removal consists of choosing two adjacent and equal letters and removing them.

Welcome to the String Processing template collection! These are ready-to-use C++ snippets for the core string patterns: sliding window, two pointers, string matching, manipulation, and parsing. If you already know...