Suppose we have a binary tree, we have to find the longest path that alternates between left and right child and going down.So, if the input is likethen the output will be 5 as the alternating path is [2, 4, 5, 7, 8].To solve this, we will follow these steps:if ... Read More

Suppose we have a list of words and a string called letters, we have to find the size of the longest word that can be made by rearranging the given letters. In the letters there may be asterisk character (*) it can match any character. And it is not necessary ... Read More

Suppose we have a list of strings; we have to find the number of words that are concatenations of other words also in the list. We can reuse words when concatenating and concatenate any number of times.So, if the input is like words = ["hello", "world", "helloworld", "famous", "worldfamous", "programming"], ... Read More

Suppose we have a 24-hour string in "hh:mm" format, we have to find the next closest time that can be formed by reusing given digits. We can reuse digits from the given string as many times as we want.So, if the input is like s = "03:15", then the output ... Read More

Suppose we have a list of prices representing the daily stock market prices of a company in chronological sequence. We have to find a same length list where the value at index i will be the minimum number of days we would have to wait until we make a profit. ... Read More

Suppose we have a string containing digits from 2-9. We have to find all possible letter combinations that the number could generate. One mapping of digit to letters (just like on the telephone buttons) is given below. Note that 1 does map some characters but no letters.12a b c3d e ... Read More

Suppose we have a n x n matrix represents a chess board. There are some 1s and 0s, where 1 represents a queen and 0 represents an empty cell. We have to check whether the board is valid solution to the N-Queen puzzle or not. As we know a board ... Read More

Suppose we have a list of lists called rooms. Each index i in rooms represents a room and rooms[i] represents different keys to open other rooms. The room 0 is open and we are at that room and every other room is locked. We can move freely between opened rooms; ... Read More

Suppose we have a number n; we have to find the nth ugly number. As we know that the ugly numbers are those numbers, whose prime factors are only 2, 3 and 5. So if we want to find 10th ugly number, the output will be 12, as the first ... Read More

Suppose we have two sorted lists. We have to find the median of these two lists. So if the arrays are like [1, 5, 8] and [2, 3, 6, 9], then the answer will be 5.To solve this, we will follow these steps:Define a function solve(), this will take an ... Read More