Leetcode Solutions

Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: "tree" Output: "e...

You are given a binary tree in which each node contains an integer value. Find the number of paths that sum to a given value. The path...

Given a string  s   and a   non-empty   string   p , find all the start indices of   p 's anagrams in   s . Strings consists of lowe...

Given a  non-empty  array containing  only positive integers , find if the array can be partitioned into two subsets such that the sum of ...

Given an  m x n  matrix of non-negative integers representing the height of each unit cell in a continent, the "Pacific ocean" t...

Given an 2D board, count how many different battleships are in it. The battleships are represented with  'X' s, empty slots are re...

Given a string that consists of only uppercase English letters, you can replace any letter in the string with another letter at most  k  ti...