Week 3

[tech-cow]

98 Validate BST * 7
https://leetcode.com/problems/validate-binary-search-tree
977 Squares of a Sorted Array *2
https://leetcode.com/problems/squares-of-a-sorted-array
140 Word Break II * 2
https://leetcode.com/problems/word-break-ii
29 Divide Two Integers *4
https://leetcode.com/problems/divide-two-integers
246 Strobogrammatic Number *2
https://leetcode.com/problems/strobogrammatic-number
450 Delete Node in a BST * 2
https://leetcode.com/problems/delete-node-in-a-bst
543 Diameter of Binary Tree *2
https://leetcode.com/problems/diameter-of-binary-tree
200 Number of Islands *3
https://leetcode.com/problems/number-of-islands
701 Insert into a Binary Search Tree * 2
https://leetcode.com/problems/insert-into-a-binary-search-tree
56 Merge Intervals *4
https://leetcode.com/problems/merge-intervals
498 Diagonal Traverse *2
https://leetcode.com/problems/diagonal-traverse
21 Merge Two Sorted Lists *3
https://leetcode.com/problems/merge-two-sorted-lists
239 Sliding Window Maximum *3
https://leetcode.com/problems/sliding-window-maximum
269 Alien Dictionary *8
https://leetcode.com/problems/alien-dictionary
636 Exclusive Time of Functions *2
https://leetcode.com/problems/exclusive-time-of-functions
986 Interval List Intersections *3
https://leetcode.com/problems/interval-list-intersections
15 3Sum *2
https://leetcode.com/problems/3sum
Follow up: cannot sort
621 Task Scheduler *2
https://leetcode.com/problems/task-scheduler
238 Product of Array Except Self *6
https://leetcode.com/problems/product-of-array-except-self
339 Nested List Weight Sum *2
https://leetcode.com/problems/nested-list-weight-sum
560 Subarray Sum Equals K *6
https://leetcode.com/problems/subarray-sum-equals-k
680 Valid Palindrome II * 4
https://leetcode.com/problems/valid-palindrome-ii
20 Valid Parentheses *2
https://leetcode.com/problems/valid-parentheses
138 Copy List with Random Pointer *2
https://leetcode.com/problems/copy-list-with-random-pointer
1027 Longest Arithmetic Sequence *2
https://leetcode.com/problems/longest-arithmetic-sequence
215. Kth Largest Element in an Array * 6
https://leetcode.com/problems/kth-largest-element-in-an-array/
490 The Maze * 2
https://leetcode.com/problems/the-maze
301 Remove Invalid Parentheses * 4
https://leetcode.com/problems/remove-invalid-parentheses
973 K Closest Points to Origin * 5
https://leetcode.com/problems/k-closest-points-to-origin
67 Add Binary *2
https://leetcode.com/problems/add-binary
199 Binary Tree Right Side View *2
https://leetcode.com/problems/binary-tree-right-side-view
126 Word Ladder II * 2
https://leetcode.com/problems/word-ladder-ii
Follow up1 ：如果要求输出最短的path怎么做
Follow up2: 可以增删字符的话怎么做
278 First Bad Version *3
https://leetcode.com/problems/first-bad-version
88 Merge Sorted Array * 3
https://leetcode.com/problems/merge-sorted-array
23 Merge k Sorted Lists *3
https://leetcode.com/problems/merge-k-sorted-lists
449 Serialize and Deserialize BST * 2
https://leetcode.com/problems/serialize-and-deserialize-bst
282 Expression Add Operators * 3
https://leetcode.com/problems/expression-add-operators
953 Verifying an Alien Dictionary *11
https://leetcode.com/problems/verifying-an-alien-dictionary
34 Find First and Last Position of Element in Sorted Array *3
https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array
349 Intersection of Two Arrays *4
https://leetcode.com/problems/intersection-of-two-arrays
125 Valid Palindrome *2
https://leetcode.com/problems/valid-palindrome
340. Longest Substring with At Most K Distinct Characters *3
https://leetcode.com/problems/longest-substring-with-at-most-k-distinct-characters/
767 Reorganize String *2
https://leetcode.com/problems/reorganize-string