摘要： 题目：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... 阅读全文

摘要： 题目：Determine if a Sudoku is valid, according to:Sudoku Puzzles - The Rules.The Sudoku board could be partially filled, where empty cells are filled wi... 阅读全文

摘要： Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in or... 阅读全文

摘要： Given a sorted array of integers, find the starting and ending position of a given target value.Your algorithm's runtime complexity must be in the ord... 阅读全文

摘要： Suppose a sorted array is rotated at some pivot unknown to you beforehand.(i.e.,0 1 2 4 5 6 7might become4 5 6 7 0 1 2).You are given a target value t... 阅读全文

摘要： Given a string containing just the characters'('and')', find the length of the longest valid (well-formed) parentheses substring.For"(()", the longest... 阅读全文

摘要： problem：Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrangement is not... 阅读全文

摘要： problem：You are given a string,S, and a list of words,L, that are all of the same length. Find all starting indices of substring(s) in S that is a con... 阅读全文

摘要： Divide two integers without using multiplication, division and mod operator.分析：题目意思很容易理解，就是不用乘除法和模运算求来做除法，很容易想到的一个方法是一直做减法，然后计数，超时。在网上找到一种解法，利用位运算，意思是... 阅读全文

摘要： Implement strStr().Returns a pointer to the first occurrence of needle in haystack, ornullif needle is not part of haystack.就是判断haystack中是否有needle，如果包... 阅读全文