Feb-28
- Review
- 0217.Contains Duplicate - Easy
- 0242.Valid Anagram - Easy
- 0001.Two Sum - Easy
- 0049.Group Anagrams - Medium
- 0347.Top K Frequent Elements - Medium
- 0271.Encode and Decode Strings - Medium
Feb-22
- Review
- 0543.Diameter of Binary Tree - Solved,
while left <= right - 0042.Trapping Rain Water - Hinted
- 0022.Generate Parentheses - Solved, Time complexity O()
- 0283.Move Zeroes - Hinted
- 0696.Count Binary Substrings - Peeked
- 0735.Asteroid Collision - Hinted,
while alive and stack
- 0543.Diameter of Binary Tree - Solved,
Feb-21
- Review
- 0146.LRU Cache - Hinted w bug, dll need
self.key, call method addself._remove - 0128.Longest Consecutive Sequence - Hinted, iterate set
- 0056.Merge Intervals - Solved,
key = lambda x:x[0] - 0011.Container w Most Water - Solved
- 0069.Sqrt(x) - edge case
- 0146.LRU Cache - Hinted w bug, dll need
Feb-20
- Review
- 0015.3Sum - Solved w bug
- Redo
- 0049.Group Anagrams - Solved
- 0003.Longest Substring wo Repeating Characters - Solved, i = right(include) - left + 1
Feb-19
- Review
- 0054.Spiral Matrix - Peeked
- 0062.Unique Paths - Peeked
Feb-18
- Review
- 0994.Rotting Oranges - Solved (take time debug)
- 0046.Permutations - Solved (better use index)
- 2965.Find Missing and Repeated Values - Solved
- 0680.Valid Palindrome II - Peaked (approach)
- 3010.Divide an Arr Into Sub With MiniCost I - Peeked (approach)
- 0069.Sqrt(x) - Peeked (do not know approach)
- 0258.Add Digits - Peeked
- Redo
Feb-17
- Review
- 0496.Next Greater Element I - better review again
- Done
- 0110.Balanced Binary Tree - Hinted
- 0845.Longest Mountain in Array - Hinted
- Redo
Feb-16
- Review
- 0240.Search a 2D Matrix II - Solved
- time complexity
- boundaries
- 0240.Search a 2D Matrix II - Solved
- Done
- 1480.Running Sum of 1d Array - Solved
- 0096.Unique Binary Search Trees - Peeked
- no idea
- 0138.Copy List with Random Pointer - Solved
- has better write
- 0496.Next Greater Element I - Peeked
- Redo:
Feb-15
- Done:
- 0133.Clone Graph - Peeked
- if
neinot in hashmap, create its clone and pushnei - always connect
- No
visitedneeded
- if
- 0075.Sort Colors - Peeked
- wrong approach
- 0169.Majority Element - Peeked
- don’t know method2
- 0070.Climbing Stairs - Peeked
- 0240.Search a 2D Matrix II - Peeked
- wrong approach
- 0133.Clone Graph - Peeked
- Redo
Feb-11
- Done:
- 0199.Binary Tree Right Side View - Solved
- 0560.Subarray Sum Equals K - Peeked
- use wrong algorithm
- 0739.Daily Temperatures - Peeked
- Redo:
Feb-08
Feb-07
- 0007.Reverse Integer Peeked
- Integers don’t have a
.reverse()method (only lists do). - Math way to reverse an integer
- Integers don’t have a
- 3752.Lexicographically Smallest Peeked No idea
Feb-06
- 0003.Longest Substring wo Repeating Characters Solved
- 0169.Majority Element Solved w/o bug