Question Link : https://leetcode.com/problems/strings-differ-by-one-character/

Difficulty: Medium

Premium: True

Question

Given a list of strings dict where all the strings are of the same length. Return true if there are 2 strings that only differ by 1 character in the same index, otherwise return false.   Example 1:

Input …

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Question Link : https://leetcode.com/problems/design-file-system/

Difficulty: Medium

Premium: True

Question

You are asked to design a file system that allows you to create new paths and associate them with different values. The format of a path is one or more concatenated strings of the form: / followed by one …

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Question Link : https://leetcode.com/problems/roman-to-integer/

Difficulty: Easy

Premium: False

Question

Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.

Symbol Value I 1 V 5 X 10 L 50 C 100 D 500 M 1000 For example, 2 is written as …

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Question Link : https://leetcode.com/problems/text-justification/

Difficulty: Hard

Premium: False

Question

Given an array of strings words and a width maxWidth, format the text such that each line has exactly maxWidth characters and is fully (left and right) justified. You should pack your words in a greedy approach; that …

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Question Link : https://leetcode.com/problems/integer-to-english-words/

Difficulty: Hard

Premium: False

Question

Convert a non-negative integer num to its English words representation.   Example 1:

Input: num = 123 Output: "One Hundred Twenty Three"

Example 2:

Input: num = 12345 Output: "Twelve Thousand Three Hundred Forty Five"

Example 3:

Input: num = 1234567 Output …

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Question Link : https://leetcode.com/problems/encode-and-decode-strings/

Difficulty: Medium

Premium: True

Question

Design an algorithm to encode a list of strings to a string. The encoded string is then sent over the network and is decoded back to the original list of strings. Machine 1 (sender) has the function:

string …

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Question Link : https://leetcode.com/problems/valid-anagram/

Difficulty: Easy

Premium: False

Question

Given two strings s and t, return true if t is an anagram of s, and false otherwise.   Example 1:

Input: s = "anagram", t = "nagaram" Output: true

Example 2:

Input: s = "rat", t = "car" Output: false

Constraints:

1 …

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Question Link : https://leetcode.com/problems/add-strings/

Difficulty: Easy

Premium: False

Question

Given two non-negative integers, num1 and num2 represented as string, return the sum of num1 and num2 as a string. You must solve the problem without using any built-in library for handling large integers (such as BigInteger). You …

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Question Link : https://leetcode.com/problems/score-of-a-string/

Difficulty: Easy

Premium: False

Question

You are given a string s. The score of a string is defined as the sum of the absolute difference between the ASCII values of adjacent characters. Return the score of s.   Example 1:

Input: s = "hello" Output …

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Question Link : https://leetcode.com/problems/optimal-partition-of-string/

Difficulty: Medium

Premium: False

Question

Given a string s, partition the string into one or more substrings such that the characters in each substring are unique. That is, no letter appears in a single substring more than once. Return the minimum number of …

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