hcx2013
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hcx2013：
mircle 写道Given nums = [1, 2, 1, ...
Single Number III -
mircle：
Given nums = [1, 2, 1, 3, 2, 5， ...
Single Number III -
hcx2013：
恩，可以，代码更简洁
空格替换 -
QuarterLifeForJava：
这样可以吗？
public static void main( ...
空格替换 -
hcx2013：
这个2是指多出2位，按你的理解可以这么改：int len = ...
空格替换
文章列表
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 order.
You may assume no duplicates in the array.
Here are few examples.[1,3,5,6], 5 → 2[1,3,5,6], 2 → 1[1,3,5,6], 7 → 4[1,3,5,6], 0 → 0
public cl ...
Search for a Range
- 博客分类：
- leetcode
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 order of O(log n).
If the target is not found in the array, return [-1, -1].
For example,Given [5, 7, 7, 8, 8, 10] and target value 8,return [3, 4]. ...
Suppose a sorted array is rotated at some pivot unknown to you beforehand.
(i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2).
You are given a target value to search. If found in the array return its index, otherwise return -1.
You may assume no duplicate exists in the array.
public class Solu ...
Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring.
For "(()", the longest valid parentheses substring is "()", which has length = 2.
Another example is ")()())", where the longest valid ...
Next Permutation
- 博客分类：
- leetcode
Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.
If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending order).
The replacement must be in-place, do not allocate extra memo ...
You are given a string, s, and a list of words, words, that are all of the same length. Find all starting indices of substring(s) in s that is a concatenation of each word in wordsexactly once and without any intervening characters.
For example, given:s: "barfoothefoobarman"words: [" ...
Divide Two Integers
- 博客分类：
- leetcode
Divide two integers without using multiplication, division and mod operator.
If it is overflow, return MAX_INT.
public class Solution {
public int divide(int dividend, int divisor) {
int r = 0;
if (divisor == 0) {
return 0;
}
if (dividend == Inte ...
Implement strStr()
- 博客分类：
- leetcode
Implement strStr().
Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
public class Solution {
public int strStr(String haystack, String needle) {
if (haystack.equals(needle) || needle.equals("")) {
return 0;
...
Remove Element
- 博客分类：
- leetcode
Given an array and a value, remove all instances of that value in place and return the new length.
The order of elements can be changed. It doesn't matter what you leave beyond the new length.
public class Solution {
public int removeElement(int[] nums, int val) {
int len = 0;
...
Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.
Do not allocate extra space for another array, you must do this in place with constant memory.
For example,Given input array nums = [1,1,2],
Your function should return length = ...
Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.
If the number of nodes is not a multiple of k then left-out nodes in the end should remain as it is.
You may not alter the values in the nodes, only nodes itself may be changed.
Only constant memory ...
Swap Nodes in Pairs
- 博客分类：
- leetcode
Given a linked list, swap every two adjacent nodes and return its head.
For example,Given 1->2->3->4, you should return the list as 2->1->4->3.
Your algorithm should use only constant space. You may not modify the values in the list, only nodes itself can be changed.
/**
* ...
Merge k Sorted Lists
- 博客分类：
- leetcode
Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
public class Solution {
public L ...
题目描述
输入某二叉树的前序遍历和中序遍历的结果，请重建出该二叉树。假设输入的前序遍历和中序遍历的结果中都不含重复的数字。例如输入前序遍历序列{1,2,4,7,3,5,6,8}和中序遍历序列{4,7,2,1,5,3,8,6}，则重建二叉树并输出它的后序遍历序列。(测试用例中，"树"的输出形式类似于树的层次遍历，没有节点的用#来代替)
/**
* Definition for binary tree
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNod ...
题目描述
输入一个链表，从尾到头打印链表每个节点的值。返回新链表的头结点。
/**
* public class ListNode {
* int val;
* ListNode next = null;
*
* ListNode(int val) {
* this.val = val;
* }
* }
*
*/
import java.util.ArrayList;
public class Solution {
ArrayList<Integer> li ...