## Sudoku Solver

Question Write a program to solve a Sudoku puzzle by filling the empty cells. Empty cells are indicated by the character ‘.’. You may assume that there will be only one unique solution. This question is provided by LeetCode.

Question Write a program to solve a Sudoku puzzle by filling the empty cells. Empty cells are indicated by the character ‘.’. You may assume that there will be only one unique solution. This question is provided by LeetCode.

QUESTION Given two words (start and end), and a dictionary, find the length of shortest transformation sequence from start to end, such that: Only one letter can be changed at a time Each intermediate word must exist in the dictionary Note: Return 0 if there is no such transformation sequence. All words have the same Read the full article…

QUESTION Given a collection of numbers that might contain duplicates, return all possible unique permutations. This question is provided by LeetCode.

QUESTION Given a collection of numbers, return all possible permutations. This question is provided by LeetCode.

QUESTION Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n = 3, a solution set is: “((()))”, “(()())”, “(())()”, “()(())”, “()()()” This question is provided by LeetCode.