leetcode
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Introduction
First Chapter
Add two numbers
Reverse integer
String to integer
palindrome number
First Unique Character in a String
Valid Number
Valid Parenthese
Find the difference
Rotated digits
Minimum distance between two nodes
Longest substring without repeting
Merge two sorted lists
remove nth node from list
remove duplicates from sorted link list
Letter combinations
merge two binary tree
minimum depth of a binary tree
climbing stairs
Keypoints
notes
Notes
notes about java
DFS
find leaves of a binary tree
Backtracking
letter combinations of a phone number
gray code
List
reverse linked list
remove linked list element
add two number
Deleted node in a linked list
linked list cycle
sort list_redo
remove duplicates from lists
remove nth node from linked list
inserted short list_redo
intersection of two linked list_redo
String
unique morse code
reverse string
reverse string II
reverse string IIII
roman to integer
jewels and stones
valid anagram
longest common prefix
to lower case
judge route circle
similar RGB colors
detect capital
goat latin
rotated digits
implement strstr
ransom note
numbers of segments in a string
find anagram
reverse vowels of a word
longest substring without repeating characters
length of last word
first unique character
brainteaser
nim game
bulb switcher
dynamic planning
maximum subarray
best time to buy and sell
best time to buy and sell ii
counting bits
Find All Numbers Disappeared in an Array
2 keys kerboard
integer break
NP perfect squares
Russian Doll Envelopes
house robber
house robber II
Array
Find all duplicates in an array
non-decreasing array
longest increasing subarray
3sum
Median of Two sorted arrays
Container with most water
Two sum
max consecutive ones
unique paths
minimum path sum
1-bit and 2-bit character
Array partition I
divide two integers
flipping an image
move zeros
product of array except current number
major elements
projection area of 3d shapes
container has most water
trapping rain water
BST
minimum absolute difference
heap
top k frequent elements
most cheap flight
Math
Pow(x,n)
Ugly Number
Add binary
Factorial Trailing zeros
valid perfect square
Power of Two
Excel Sheet Column Number
Excel sheet column number ii
Plus one
Bit operation
Single number
hamming distance
single numberII
binary search
sqrt(x)
search insert position
intersection of two arrays
guess number higher or lower
first bad version
stack
valid parenthese
valid parenthese (java)
Tree
Average of Levels in Binary Tree
binary tree inorder traversal
balanced binary tree
same tree
path sum
binary tree level traversal
search in a binary search tree
invert a binary tree
Binary Tree Zigzag Level Order Traversal
validate binary search tree_redo
trim a binary search tree
sum of left leaves
insert into a binary search tree
convert bst to greater tree
binary tree postorder
n-array postorder traversel
Diameter of a tree
maximum depth of n-array tree
maximum depth of a binary tree
Find Largest Value in Each Tree Row
maximum binary tree
Greddy
meeting room II_redo
assign cookies
room
queue construction by height
lemonade change
candy
queue
sparse matrix multiplication
design circular queue
Hash table
sort
intersection of two arrays
set colors
maximum gap
wiggle sort
H-index
SQL
Big countries
class more than 5 students
second highest salart
recursion
output contest result
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longest common prefix
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