Given a string s and a list of strings dict, you need to add a closed pair of bold tag and to wrap the substrings in s that exist in dict. If two such ...

Given a set of keywords words and a string S, make all appearances of all keywords in S bold. Any letters between <b> and </b> tags become ...

You are standing at position 0 on an infinite number line. There is a goal at position target. On each move, you can either go left or right. During t ...

Given two integers L and R, find the count of numbers in the range [L, R] (inclusive) having a prime number of set bits in their binary representation ...

In a given integer array nums, there is always exactly one largest element. Find whether the largest element in the array is at least twice as much as ...

On a staircase, the i-th step has some non-negative cost cost[i] assigned (0 indexed). Once you pay the cost, you can either climb one or two steps. Y ...

Given an array of integers nums, write a method that returns the “pivot” index of this array. We define the pivot index as the index where the sum of ...

A leopard can’t change its spotshe won’t change. He will always be the same person and his bad habits are here to stay. ExamplesI told Karen she had t ...

Given a string and a string dictionary, find the longest string in the dictionary that can be formed by deleting some characters of the given string. ...

Given a list of strings words representing an English Dictionary, find the longest word in words that can be built one character at a time by other wo ...