03-2026

Mar-17

• 1152.Analyze User Website Visit Pattern - Hinted
  • I did in wrong way, don’t know the solution

Mar-17

• 0143.Reorder List - Reviewed solved
• 0048.Rotate Image - Reviewed solved
• 1249.Minimum Remove to Make Valid Parentheses

Mar-16

• 0206.Reverse Linked List - Solved
• 0143.Reorder List - Peeked

Mar-15

• 1590.Make Sum Divisible by P
  • Peeked, confused to find use remainder, p, prefix[i] to find prefix[j]

Mar-14

• 0155.Min Stack - Peeked

Mar-09

• 0567.Permutation in String - Solved

Mar-08

• 0042.Trapping Rain Water - Solved
• 0380.Insert Delete GetRandom O(1) - Peeked

Mar-07

• 2672.Number of Adjacent Elements With the Same Color - Hinted
• 2791.Count Paths That Can Form a Palindrome in a Tree - Peeked

Mar-06

• 0121.Best Time to Buy and Sell Stock - Solved
• 0207.Course Schedule - Solved BFS, add DFS
• 1944.Number of Visible People in a Queue
  • Peeked, don’t understand stack
• 0215.Kth Largest Element in an Array - Solved
• 0875.Koko Eating Bananas - Peekd
  • eat to fast need slow, right = spd - 1
• 0840.Magic Squares In Grid - Peeked
  • Got stuck on how to iterate through each candidate 3 x 3 square

Mar-05

• 0200.Number of Islands - Solved
  • Use deque([(r, c)]) not deque((r, c))
• 0994.Rotting Oranges - Solved
• 0022.Generate Parentheses - Hinted
  • typo pop()

Mar-04

• 0146.LRU Cache - Solved w bug
  • Fixed: del dictionary[key]
  • typo self.node
• 0056.Merge Intervals - Solved
• 0198.House Robber - Hinted, missed index
• 0057.Insert Interval - Peeked,
  • Key fix: keep updating newInterval while it overlaps with current intervals

Mar-03

• 0048.Rotate Image - Peeked, forget transpose + reverse
• 0424.Longest Repeating Character Replacement - Hinted, need redo

Mar-02

• 0167.Two Sum II - Solved
• 0128.Longest Consecutive Sequence - Peeked
• 0036.Valid Sudoku - Solved
  • index calculated, index // 3
• 0015.3Sum - Peeked, return val not index
• 0011.Container w Most Water - Solved
• 0003.Longest Substring wo Repeating Characters - Solved

Mar-01

• 0271.Encode and Decode Strings - Solved, index confused
• 0238.Product of Array Except Self - Peek, suffix, right-side product