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题解

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在二叉树中找到两个节点的最近公共祖先

import java.util.*; /* * public class TreeNode { * int val = 0; * TreeNode left = null; * TreeNode right = null; * } */ public class Sol...

2020-11-19

1 433

用两个栈实现队列

import java.util.Stack; public class Solution { Stack<Integer> stack1 = new Stack<Integer>(); Stack<Integer> stack2 = new S...

2020-11-19

0 370

删除链表的倒数第n个节点

import java.util.*; /* * public class ListNode { * int val; * ListNode next = null; * } */ public class Solution { /** * * @...

2020-11-19

0 439

链表中的节点每k个一组翻转

import java.util.*; /* * public class ListNode { * int val; * ListNode next = null; * } */ public class Solution { /** * * @...

2020-11-19

0 599

跳台阶

public class Solution { public int JumpFloor(int target) { if(target==0) { return 0; } if(target==1) ...

2020-11-19

0 374

求二叉树的层序遍历

import java.util.*; /* * public class TreeNode { * int val = 0; * TreeNode left = null; * TreeNode right = null; * } */ public class So...

2020-11-19

0 488

最小的K个数

import java.util.*; public class Solution { public ArrayList<Integer> GetLeastNumbers_Solution(int [] input, int k) { ArrayList<...

2020-11-19

0 352

合并有序链表

import java.util.*; /* * public class ListNode { * int val; * ListNode next = null; * } */ public class Solution { /** * * @...

2020-11-19

0 513

寻找第K大

import java.util.*; public class Finder { public static int findKth(int[] a, int n, int K) { return quickSort(a,0,n-1,K); // wri...

2020-11-19

0 496

实现二叉树先序，中序和后序遍历

import java.util.*; public class Solution { /** * * @param root TreeNode类 the root of binary tree * @return int整型二维数组 */ ...

2020-11-19

0 439