刷题记录贴

1.all subsets I
2.all subsets II
3.spiral order traverse
      recursion
      iteration

Get
nqueen time complexity
Collections.sort()
hashset.add() as if condition

search in sorted matrixI
     find the target row by binary search
is balanced tree
     brute force worst time complexity
is subtree s, t
     worst time complexity
kth smalltest in unsorted array
      max heap method

cut woodI
mergeStones
    wrong answer
find common in three sorted arrays
    compile error
merge k sorted array
    compile error. int can't be deferenced
    outOfBoundException
    compile error
    object[] can't be deferenced to Integer[]

percolate Down
percolate Up
k smallest pair in two sorted array
wordLadder
      compile error
      wrong answer
wordLadder II
       compile error
      wrong answer

1. rotate image 90 clockwise,  counter-clockwise
    method1
    method2
2. permutations no duplicate
    method1
    method2
3. permutation with duplicate
    method1

Set Matrix Zeroes
   compile error
Binary Search Tree Iterator
   run time error


补充内容 (2017-9-13 14:37):
test

reverse linked list  
      iteration
      recursion
swap nodes in pairs
       iteration
       recursion

Kth Smallest in unsorted array
       quickselect
             compile error, function parameter  one less
Inorder traverse
       iteration

wood cut
         look at solution
iterator
construct unique BST

word breakII
   dp
   recursion + memorization

peek iterator

longest palindrome substring
        DP  wrong answer
        loop by mirror

longest common subsequence

Edit distance