Ruizhi Ma's Blog

Keep Calm and Carry On

Problem 71

Solution URL https://leetcode.com/submissions/detail/412039107/ 代码 class Solution { public String simplifyPath(String path) { //Time: O(n) //Space: O(n) String tokens...

Posted by Ruizhi Ma on October 22, 2020

Problem 394

Solution URL https://leetcode.com/submissions/detail/412071922/ 代码 class Solution { public String decodeString(String s) { //ans: https://leetcode-cn.com/problems/decode-string/solut...

Posted by Ruizhi Ma on October 22, 2020

Problem 232

Solution URL https://leetcode.com/submissions/detail/411969247/ 代码 class MyQueue { //https://leetcode-cn.com/problems/implement-queue-using-stacks/solution/yong-zhan-shi-xian-dui-lie-by-leet...

Posted by Ruizhi Ma on October 22, 2020

Problem 225

Solution URL https://leetcode.com/submissions/detail/411981168/ 代码 class MyStack { //ans: https://leetcode-cn.com/problems/implement-stack-using-queues/solution/yong-dui-lie-shi-xian-zhan-by...

Posted by Ruizhi Ma on October 22, 2020

Problem 150

Solution URL https://leetcode.com/submissions/detail/412013996/ 代码 class Solution { public int evalRPN(String[] tokens) { //Time: O(n) //Space: O(n) Stack<Integer&...

Posted by Ruizhi Ma on October 22, 2020

Problem 155

Solution URL https://leetcode.com/submissions/detail/411645232/ 代码 class MinStack { //ref: https://leetcode-cn.com/problems/min-stack/solution/zui-xiao-zhan-by-leetcode-solution/ //Time:...

Posted by Ruizhi Ma on October 21, 2020

Problem 130

Solution URL https://leetcode.com/submissions/detail/411553487/ 代码 class Solution { //BFS //定义方向 public static final List<int[]> DIRECTIONS = Arrays.asList( new int[]{1...

Posted by Ruizhi Ma on October 21, 2020

Problem 27

Remove Element

问题描述 https://leetcode.com/problems/remove-element/ 解决思路(2019-12-23) use two pointer, the first pointer marks the element which is different from the val, the second pointer traverses the whole ...

Posted by Ruizhi Ma on December 23, 2019

Problem 26

Remove Duplicates from Sorted Array

问题描述 https://leetcode.com/problems/remove-duplicates-from-sorted-array/ 解决思路（2019-12-23） use two pointer. the first pointer marks the postion not repeated, and the second pointer marks the trav...

Posted by Ruizhi Ma on December 23, 2019

Problem 24

Swap Nodes In Pairs

问题描述 https://leetcode.com/problems/swap-nodes-in-pairs/ 解决思路(2019-12-22) while curr.next.next != null && curr.next != null, swap the two node the specific steps of swap coded in the f...

Posted by Ruizhi Ma on December 22, 2019