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題號難度重要性題目第一次是否解出來解題思路其他解法學到技巧複習次數複習筆記上次解題時間
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#1EasyTwo Sum
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#535MediumEncode and Decode TinyURL
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#3MediumLongest Substring Without Repeating Characters
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#85HardMaximal Rectangle
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#37HardSudoku Solver
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#94MediumBinary Tree Inorder Traversal
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#739MediumDaily Temperatures
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#18Medium4Sum
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#136EasySingle Number
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#202EasyHappy Number
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#349EasyIntersection of Two Arrays
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#463EasyIsland Perimeter
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#30HardSubstring with Concatenation of All Words
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#632HardSmallest Range Covering Elements from K Lists
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#718MediumMaximum Length of Repeated Subarray
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#76HardMinimum Window Substring
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#500EasyKeyboard Row
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#187MediumRepeated DNA Sequences
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#560MediumSubarray Sum Equals K
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#447EasyNumber of Boomerangs
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#49MediumGroup Anagrams
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#138MediumCopy List with Random Pointer
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#409EasyLongest Palindrome
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#690EasyEmployee Importance
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#204EasyCount Primes
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#347MediumTop K Frequent Elements
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#525MediumContiguous Array
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#726HardNumber of Atoms
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#36MediumValid Sudoku
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#454Medium4Sum II
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#1044HardLongest Duplicate Substring
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#781MediumRabbits in Forest
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#594EasyLongest Harmonious Subsequence
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#389EasyFind the Difference
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#336HardPalindrome Pairs
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#149HardMax Points on a Line
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#217EasyContains Duplicate
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#290EasyWord Pattern
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#242EasyValid Anagram
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#219EasyContains Duplicate II
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#274MediumH-Index
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#350EasyIntersection of Two Arrays II
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#575EasyDistribute Candies
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#205EasyIsomorphic Strings
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#299EasyBulls and Cows
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#438MediumFind All Anagrams in a String
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#645EasySet Mismatch
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#355MediumDesign Twitter
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#508MediumMost Frequent Subtree Sum
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#720EasyLongest Word in Dictionary
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#166MediumFraction to Recurring Decimal
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#648MediumReplace Words
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#1001HardGrid Illumination
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#387EasyFirst Unique Character in a String
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#451MediumSort Characters By Frequency
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#554MediumBrick Wall
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#676MediumImplement Magic Dictionary
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#692MediumTop K Frequent Words
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#966MediumVowel Spellchecker
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#711HardNumber of Distinct Islands II
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#381HardInsert Delete GetRandom O(1) - Duplicates allowed
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#599EasyMinimum Index Sum of Two Lists
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#609MediumFind Duplicate File in System
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#244MediumShortest Word Distance II
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#380MediumInsert Delete GetRandom O(1)
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#311MediumSparse Matrix Multiplication
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#325MediumMaximum Size Subarray Sum Equals k
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#159MediumLongest Substring with At Most Two Distinct Characters
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#314MediumBinary Tree Vertical Order Traversal
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#359EasyLogger Rate Limiter
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#694MediumNumber of Distinct Islands
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#358HardRearrange String k Distance Apart
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#249MediumGroup Shifted Strings
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#288MediumUnique Word Abbreviation
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#734EasySentence Similarity
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#340HardLongest Substring with At Most K Distinct Characters
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#266EasyPalindrome Permutation
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#624EasyMaximum Distance in Arrays
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#170EasyTwo Sum III - Data structure design
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#356MediumLine Reflection
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#246EasyStrobogrammatic Number
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