betty1121的博客

172. Remove ElementGiven an array and a value, remove all occurrences of that value in place and return the new length.The order of elements can be changed, and the elements after the new length don't...

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are all valid bu...

495. Implement StackImplement a stack. You can use any data structure inside a stack except stack itself to implement it.class Stack: """ @param: x: An integer @return: nothing """ ...

Insert a node in a sorted linked list.ExampleGiven list = 1->4->6->8 and val = 5.Return 1->4->5->6->8.class Solution: """ @param head: The head of linked list. @param ...

Find a node with given value in a linked list. Return null if not exists.ExampleGiven 1->2->3 and value = 3, return the last node.Given 1->2->3 and value = 4, return null.class Solution: ...

Convert a linked list to an array list.ExampleGiven 1->2->3->null, return [1,2,3]class Solution: """ @param head: the head of linked list. @return: An integer list """ def...

Given an array of integers, remove the duplicate numbers in it.You should:Do it in place in the array.Move the unique numbers to the front of the array.Return the total number of the unique numbers.Ex...

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.Example"A man, a plan, a canal: Panama" is a palindrome."race a car" is not a palindrome.Ch...

Given an input string, reverse the string word by word.For example,Given s = "the sky is blue",return "blue is sky the".class Solution: """ @param: s: A string @return: A string """ ...

Description As the title described, you should only use two stacks to implement a queue's actions. The queue should support push(element), pop() and top() where pop is pop the first(a.k.a front) ele...