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1
IDTitleAcceptanceDifficultyFrequencyLeetcode Question Link
2
937Reorder Data in Log Files54.3%Easy3.9944355947998136 https://leetcode.com/problems/reorder-data-in-log-files
3
1192Critical Connections in a Network48.6%Hard3.925598813161921 https://leetcode.com/problems/critical-connections-in-a-network
4
200Number of Islands46.8%Medium3.7781578407565197 https://leetcode.com/problems/number-of-islands
5
994Rotting Oranges49.2%Medium3.6307168683511186 https://leetcode.com/problems/rotting-oranges
6
819Most Common Word44.8%Easy3.4832758959457175 https://leetcode.com/problems/most-common-word
7
138Copy List with Random Pointer36.4%Medium3.452672602379887 https://leetcode.com/problems/copy-list-with-random-pointer
8
763Partition Labels76.1%Medium3.305231629974486 https://leetcode.com/problems/partition-labels
9
692Top K Frequent Words51.8%Medium3.256820919958484 https://leetcode.com/problems/top-k-frequent-words
10
146LRU Cache33.2%Medium3.109379947553083 https://leetcode.com/problems/lru-cache
11
1Two Sum45.6%Easy2.9619389751476817 https://leetcode.com/problems/two-sum
12
572Subtree of Another Tree44.1%Easy2.945568993322194 https://leetcode.com/problems/subtree-of-another-tree
13
240Search a 2D Matrix II43.2%Medium2.798128020916793 https://leetcode.com/problems/search-a-2d-matrix-ii
14
5Longest Palindromic Substring29.5%Medium2.7358200747627843 https://leetcode.com/problems/longest-palindromic-substring
15
21Merge Two Sorted Lists53.5%Easy2.678307039145778 https://leetcode.com/problems/merge-two-sorted-lists
16
472Concatenated Words43.7%Hard2.636650106787832 https://leetcode.com/problems/concatenated-words
17
973K Closest Points to Origin63.8%Medium2.6240138122465444 https://leetcode.com/problems/k-closest-points-to-origin
18
23Merge k Sorted Lists40.2%Hard2.5524109933277668 https://leetcode.com/problems/merge-k-sorted-lists
19
1167Minimum Cost to Connect Sticks62.8%Medium2.423130930639536 https://leetcode.com/problems/minimum-cost-to-connect-sticks
20
957Prison Cells After N Days40.7%Medium2.42269136604331 https://leetcode.com/problems/prison-cells-after-n-days
21
295Find Median from Data Stream44.3%Hard2.3279113755186978 https://leetcode.com/problems/find-median-from-data-stream
22
42Trapping Rain Water48.9%Hard2.204080367616883 https://leetcode.com/problems/trapping-rain-water
23
1152Analyze User Website Visit Pattern43.5%Medium2.1610636126719283 https://leetcode.com/problems/analyze-user-website-visit-pattern
24
1268Search Suggestions System63.2%Medium2.157831912757614 https://leetcode.com/problems/search-suggestions-system
25
588Design In-Memory File System45.9%Hard2.113625008500926 https://leetcode.com/problems/design-in-memory-file-system
26
460LFU Cache34.2%Hard2.029678026599572 https://leetcode.com/problems/lfu-cache
27
297Serialize and Deserialize Binary Tree47.5%Hard1.882237054194171 https://leetcode.com/problems/serialize-and-deserialize-binary-tree
28
642Design Search Autocomplete System44.7%Hard1.850014447447311 https://leetcode.com/problems/design-search-autocomplete-system
29
348Design Tic-Tac-Toe54.3%Medium1.8169700410705985 https://leetcode.com/problems/design-tic-tac-toe
30
127Word Ladder29.6%Medium1.798979717201542 https://leetcode.com/problems/word-ladder
31
694Number of Distinct Islands56.0%Medium1.6879409739220441 https://leetcode.com/problems/number-of-distinct-islands
32
212Word Search II34.9%Hard1.679541552723447 https://leetcode.com/problems/word-search-ii
33
126Word Ladder II22.1%Hard1.6793805521461769 https://leetcode.com/problems/word-ladder-ii
34
253Meeting Rooms II45.7%Medium1.6660486200337488 https://leetcode.com/problems/meeting-rooms-ii
35
273Integer to English Words27.1%Hard1.5969629753826686 https://leetcode.com/problems/integer-to-english-words
36
1102Path With Maximum Minimum Value49.2%Medium1.586376093728572 https://leetcode.com/problems/path-with-maximum-minimum-value
37
866Prime Palindrome24.9%Medium1.5508753832260214 https://leetcode.com/problems/prime-palindrome
38
380Insert Delete GetRandom O(1)47.5%Medium1.4345204100538291 https://leetcode.com/problems/insert-delete-getrandom-o1
39
1099Two Sum Less Than K60.6%Easy1.374401545094067 https://leetcode.com/problems/two-sum-less-than-k
40
2Add Two Numbers33.9%Medium1.309433027705025 https://leetcode.com/problems/add-two-numbers
41
121Best Time to Buy and Sell Stock50.5%Easy1.3027850571141735 https://leetcode.com/problems/best-time-to-buy-and-sell-stock
42
49Group Anagrams56.9%Medium1.2743748777523694 https://leetcode.com/problems/group-anagrams
43
139Word Break40.1%Medium1.2351186358489528 https://leetcode.com/problems/word-break
44
20Valid Parentheses39.0%Easy1.1894789144026565 https://leetcode.com/problems/valid-parentheses
45
863All Nodes Distance K in Binary Tree55.4%Medium1.1822332875060502 https://leetcode.com/problems/all-nodes-distance-k-in-binary-tree
46
1000Minimum Cost to Merge Stones39.8%Hard1.1653622592057065 https://leetcode.com/problems/minimum-cost-to-merge-stones
47
153Sum26.8%Medium1.1582544171399092 https://leetcode.com/problems/3sum
48
269Alien Dictionary33.3%Hard1.152241098330318 https://leetcode.com/problems/alien-dictionary
49
239Sliding Window Maximum43.0%Hard1.1502557728555012 https://leetcode.com/problems/sliding-window-maximum
50
545Boundary of Binary Tree38.9%Medium1.1251501588677701 https://leetcode.com/problems/boundary-of-binary-tree
51
909Snakes and Ladders38.4%Medium1.0669891002375975 https://leetcode.com/problems/snakes-and-ladders
52
733Flood Fill55.3%Easy1.0669060422540164 https://leetcode.com/problems/flood-fill
53
99Recover Binary Search Tree39.7%Hard1.0625115814692296 https://leetcode.com/problems/recover-binary-search-tree
54
238Product of Array Except Self60.1%Medium1.0368856026788111 https://leetcode.com/problems/product-of-array-except-self
55
155Min Stack44.5%Easy1.0332086228823416 https://leetcode.com/problems/min-stack
56
3Longest Substring Without Repeating Characters30.4%Medium0.9915478841688382 https://leetcode.com/problems/longest-substring-without-repeating-characters
57
490The Maze51.4%Medium0.9467105081323941 https://leetcode.com/problems/the-maze
58
353Design Snake Game34.2%Medium0.9400316341694208 https://leetcode.com/problems/design-snake-game
59
322Coin Change35.5%Medium0.930364459085817 https://leetcode.com/problems/coin-change
60
17Letter Combinations of a Phone Number46.8%Medium0.9202313417131626 https://leetcode.com/problems/letter-combinations-of-a-phone-number
61
140Word Break II32.6%Hard0.915097284840888 https://leetcode.com/problems/word-break-ii
62
54Spiral Matrix34.1%Medium0.9117152787807635 https://leetcode.com/problems/spiral-matrix
63
53Maximum Subarray46.5%Easy0.9028149401651969 https://leetcode.com/problems/maximum-subarray
64
74Search a 2D Matrix36.5%Medium0.9027789280658293 https://leetcode.com/problems/search-a-2d-matrix
65
56Merge Intervals39.3%Medium0.8719401675539429 https://leetcode.com/problems/merge-intervals
66
1155Number of Dice Rolls With Target Sum49.0%Medium0.8666032186425704 https://leetcode.com/problems/number-of-dice-rolls-with-target-sum
67
227Basic Calculator II36.9%Medium0.865227243301703 https://leetcode.com/problems/basic-calculator-ii
68
33Search in Rotated Sorted Array34.5%Medium0.8584888773941517 https://leetcode.com/problems/search-in-rotated-sorted-array
69
224Basic Calculator36.8%Hard0.8569364892249722 https://leetcode.com/problems/basic-calculator
70
12Integer to Roman55.1%Medium0.8496820889352563 https://leetcode.com/problems/integer-to-roman
71
815Bus Routes42.5%Hard0.8477684486311822 https://leetcode.com/problems/bus-routes
72
772Basic Calculator III41.3%Hard0.8430873278508602 https://leetcode.com/problems/basic-calculator-iii
73
706Design HashMap61.3%Easy0.8231356111081237 https://leetcode.com/problems/design-hashmap
74
981Time Based Key-Value Store53.1%Medium0.8180951326968029 https://leetcode.com/problems/time-based-key-value-store
75
456132 Pattern28.9%Medium0.8138174114576592 https://leetcode.com/problems/132-pattern
76
759Employee Free Time66.2%Hard0.8088525092565556 https://leetcode.com/problems/employee-free-time
77
437Path Sum III47.2%Medium0.7976226188683302 https://leetcode.com/problems/path-sum-iii
78
503Next Greater Element II56.5%Medium0.7968165955277405 https://leetcode.com/problems/next-greater-element-ii
79
208Implement Trie (Prefix Tree)49.4%Medium0.7928548865863879 https://leetcode.com/problems/implement-trie-prefix-tree
80
236Lowest Common Ancestor of a Binary Tree45.7%Medium0.7928508522150108 https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree
81
97Interleaving String31.5%Hard0.7716773297315191 https://leetcode.com/problems/interleaving-string
82
1091Shortest Path in Binary Matrix38.2%Medium0.7689762247924476 https://leetcode.com/problems/shortest-path-in-binary-matrix
83
173Binary Search Tree Iterator56.6%Medium0.7549245402561885 https://leetcode.com/problems/binary-search-tree-iterator
84
980Unique Paths III73.3%Hard0.7472144018302211 https://leetcode.com/problems/unique-paths-iii
85
277Find the Celebrity41.8%Medium0.7348429454547184 https://leetcode.com/problems/find-the-celebrity
86
496Next Greater Element I63.8%Easy0.7306413849875257 https://leetcode.com/problems/next-greater-element-i
87
535Encode and Decode TinyURL79.9%Medium0.7284232783609871 https://leetcode.com/problems/encode-and-decode-tinyurl
88
4Median of Two Sorted Arrays29.6%Hard0.7245935911034281 https://leetcode.com/problems/median-of-two-sorted-arrays
89
45Jump Game II30.6%Hard0.7215178776891609 https://leetcode.com/problems/jump-game-ii
90
726Number of Atoms49.0%Hard0.7191226669632059 https://leetcode.com/problems/number-of-atoms
91
211Add and Search Word - Data structure design38.1%Medium0.7175070272224768 https://leetcode.com/problems/add-and-search-word-data-structure-design
92
64Minimum Path Sum54.5%Medium0.7123229317280146 https://leetcode.com/problems/minimum-path-sum
93
1044Longest Duplicate Substring31.9%Hard0.707512950361979 https://leetcode.com/problems/longest-duplicate-substring
94
314Binary Tree Vertical Order Traversal45.3%Medium0.7042169874893927 https://leetcode.com/problems/binary-tree-vertical-order-traversal
95
739Daily Temperatures63.3%Medium0.697297868866036 https://leetcode.com/problems/daily-temperatures
96
394Decode String50.0%Medium0.6892445361899827 https://leetcode.com/problems/decode-string
97
323Number of Connected Components in an Undirected Graph56.0%Medium0.6754476034605444 https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph
98
449Serialize and Deserialize BST52.0%Medium0.6727822146017972 https://leetcode.com/problems/serialize-and-deserialize-bst
99
403Frog Jump39.7%Hard0.6655201946784034 https://leetcode.com/problems/frog-jump
100
143Reorder List37.1%Medium0.6644936178538985 https://leetcode.com/problems/reorder-list
101
11Container With Most Water50.8%Medium0.6631685190860763 https://leetcode.com/problems/container-with-most-water
102
1038Binary Search Tree to Greater Sum Tree80.8%Medium0.6563976383512038 https://leetcode.com/problems/binary-search-tree-to-greater-sum-tree
103
640Solve the Equation42.0%Medium0.648363577932972 https://leetcode.com/problems/solve-the-equation
104
895Maximum Frequency Stack60.6%Hard0.6397557387655486 https://leetcode.com/problems/maximum-frequency-stack
105
165Compare Version Numbers27.4%Medium0.6394004632572682 https://leetcode.com/problems/compare-version-numbers
106
210Course Schedule II40.7%Medium0.6329329320920142 https://leetcode.com/problems/course-schedule-ii
107
91Decode Ways24.7%Medium0.6216605021582633 https://leetcode.com/problems/decode-ways
108
767Reorganize String48.7%Medium0.6188332351820143 https://leetcode.com/problems/reorganize-string
109
1219Path with Maximum Gold65.1%Medium0.6151572787436681 https://leetcode.com/problems/path-with-maximum-gold
110
543Diameter of Binary Tree48.4%Easy0.6049865380663455 https://leetcode.com/problems/diameter-of-binary-tree
111
399Evaluate Division51.6%Medium0.6025713727780729 https://leetcode.com/problems/evaluate-division
112
109Convert Sorted List to Binary Search Tree47.7%Medium0.5978370007556205 https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree
113
1214Two Sum BSTs67.6%Medium0.5957174923400869 https://leetcode.com/problems/two-sum-bsts
114
721Accounts Merge48.8%Medium0.5908536653497264 https://leetcode.com/problems/accounts-merge
115
445Add Two Numbers II54.5%Medium0.5844726602120818 https://leetcode.com/problems/add-two-numbers-ii
116
55Jump Game34.6%Medium0.5804024133599197 https://leetcode.com/problems/jump-game
117
317Shortest Distance from All Buildings41.4%Hard0.5785023490481647 https://leetcode.com/problems/shortest-distance-from-all-buildings
118
362Design Hit Counter63.7%Medium0.5752838074863666 https://leetcode.com/problems/design-hit-counter
119
634Find the Derangement of An Array40.1%Medium0.5623075796011341 https://leetcode.com/problems/find-the-derangement-of-an-array
120
987Vertical Order Traversal of a Binary Tree36.6%Medium0.5577804658218486 https://leetcode.com/problems/vertical-order-traversal-of-a-binary-tree
121
105Construct Binary Tree from Preorder and Inorder Traversal48.8%Medium0.5575777917297663 https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal
122
289Game of Life54.5%Medium0.552915490474362 https://leetcode.com/problems/game-of-life
123
489Robot Room Cleaner69.7%Hard0.5479829869763493 https://leetcode.com/problems/robot-room-cleaner
124
341Flatten Nested List Iterator52.9%Medium0.5461187395622055 https://leetcode.com/problems/flatten-nested-list-iterator
125
93Restore IP Addresses35.6%Medium0.541488403342866 https://leetcode.com/problems/restore-ip-addresses
126
207Course Schedule43.1%Medium0.5403433580969076 https://leetcode.com/problems/course-schedule
127
770Basic Calculator IV48.1%Hard0.538996500732687 https://leetcode.com/problems/basic-calculator-iv
128
480Sliding Window Median37.2%Hard0.5274955113973754 https://leetcode.com/problems/sliding-window-median
129
76Minimum Window Substring34.6%Hard0.5242373922767427 https://leetcode.com/problems/minimum-window-substring
130
1429First Unique Number47.0%Medium0.5239621016713606 https://leetcode.com/problems/first-unique-number
131
622Design Circular Queue43.7%Medium0.5230167669664014 https://leetcode.com/problems/design-circular-queue
132
103Binary Tree Zigzag Level Order Traversal48.3%Medium0.5211513032333475 https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal
133
206Reverse Linked List62.5%Easy0.5170143403889669 https://leetcode.com/problems/reverse-linked-list
134
215Kth Largest Element in an Array55.4%Medium0.5073003557203055 https://leetcode.com/problems/kth-largest-element-in-an-array
135
347Top K Frequent Elements61.2%Medium0.504202490273986 https://leetcode.com/problems/top-k-frequent-elements
136
22Generate Parentheses62.7%Medium0.4881938233057933 https://leetcode.com/problems/generate-parentheses
137
1236Web Crawler64.3%Medium0.48550781578170077 https://leetcode.com/problems/web-crawler
138
388Longest Absolute File Path41.8%Medium0.4754236967150748 https://leetcode.com/problems/longest-absolute-file-path
139
352Data Stream as Disjoint Intervals47.3%Hard0.47516062535545167 https://leetcode.com/problems/data-stream-as-disjoint-intervals
140
188Best Time to Buy and Sell Stock IV28.0%Hard0.46969134068857316 https://leetcode.com/problems/best-time-to-buy-and-sell-stock-iv
141
116Populating Next Right Pointers in Each Node45.2%Medium0.4677920544408954 https://leetcode.com/problems/populating-next-right-pointers-in-each-node
142
36Valid Sudoku48.7%Medium0.46376952253193504 https://leetcode.com/problems/valid-sudoku
143
1046Last Stone Weight62.2%Easy0.46111558994152596 https://leetcode.com/problems/last-stone-weight
144
98Validate Binary Search Tree27.8%Medium0.4560506048962707 https://leetcode.com/problems/validate-binary-search-tree
145
25Reverse Nodes in k-Group42.1%Hard0.4557571315683002 https://leetcode.com/problems/reverse-nodes-in-k-group
146
465Optimal Account Balancing46.9%Hard0.44746022914476763 https://leetcode.com/problems/optimal-account-balancing
147
221Maximal Square37.7%Medium0.4439595076531865 https://leetcode.com/problems/maximal-square
148
124Binary Tree Maximum Path Sum34.3%Hard0.44128780123683403 https://leetcode.com/problems/binary-tree-maximum-path-sum
149
384Shuffle an Array52.8%Medium0.4403223646462055 https://leetcode.com/problems/shuffle-an-array
150
564Find the Closest Palindrome19.7%Hard0.43712242797885603 https://leetcode.com/problems/find-the-closest-palindrome
151
84Largest Rectangle in Histogram35.2%Hard0.42904427702947245 https://leetcode.com/problems/largest-rectangle-in-histogram
152
737Sentence Similarity II45.8%Medium0.4265185173059967 https://leetcode.com/problems/sentence-similarity-ii
153
218The Skyline Problem34.6%Hard0.42040668810636345 https://leetcode.com/problems/the-skyline-problem
154
199Binary Tree Right Side View54.1%Medium0.41496535680316016 https://leetcode.com/problems/binary-tree-right-side-view
155
997Find the Town Judge50.1%Easy0.41333031719338453 https://leetcode.com/problems/find-the-town-judge
156
46Permutations63.5%Medium0.41293686083744285 https://leetcode.com/problems/permutations
157
79Word Search35.6%Medium0.41227293846941043 https://leetcode.com/problems/word-search
158
735Asteroid Collision41.0%Medium0.4100436801024917 https://leetcode.com/problems/asteroid-collision
159
675Cut Off Trees for Golf Event34.6%Hard0.40225040958769004 https://leetcode.com/problems/cut-off-trees-for-golf-event
160
378Kth Smallest Element in a Sorted Matrix54.3%Medium0.4017523534768937 https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix
161
1011Capacity To Ship Packages Within D Days58.1%Medium0.3980529335976609 https://leetcode.com/problems/capacity-to-ship-packages-within-d-days
162
1335Minimum Difficulty of a Job Schedule57.6%Hard0.3963047387095001 https://leetcode.com/problems/minimum-difficulty-of-a-job-schedule
163
85Maximal Rectangle37.7%Hard0.3942163955722937 https://leetcode.com/problems/maximal-rectangle
164
1197Minimum Knight Moves36.1%Medium0.39358878405685155 https://leetcode.com/problems/minimum-knight-moves
165
688Knight Probability in Chessboard48.9%Medium0.38977851194046487 https://leetcode.com/problems/knight-probability-in-chessboard
166
57Insert Interval33.5%Hard0.3889321379062142 https://leetcode.com/problems/insert-interval
167
1215Stepping Numbers41.6%Medium0.3856624808119847 https://leetcode.com/problems/stepping-numbers
168
1057Campus Bikes57.7%Medium0.3787139017009125 https://leetcode.com/problems/campus-bikes
169
75Sort Colors47.3%Medium0.3727364556976202 https://leetcode.com/problems/sort-colors
170
101Symmetric Tree46.8%Easy0.372371993620526 https://leetcode.com/problems/symmetric-tree
171
1279Traffic Light Controlled Intersection74.3%Easy0.37117603462953225 https://leetcode.com/problems/traffic-light-controlled-intersection
172
336Palindrome Pairs33.7%Hard0.3591927799310734 https://leetcode.com/problems/palindrome-pairs
173
556Next Greater Element III31.7%Medium0.3584697395147556 https://leetcode.com/problems/next-greater-element-iii
174
978Longest Turbulent Subarray46.6%Medium0.3581093214258754 https://leetcode.com/problems/longest-turbulent-subarray
175
1032Stream of Characters48.3%Hard0.35736199308977074 https://leetcode.com/problems/stream-of-characters
176
387First Unique Character in a String53.4%Easy0.3502477066068738 https://leetcode.com/problems/first-unique-character-in-a-string
177
332Reconstruct Itinerary36.7%Medium0.3499348287861282 https://leetcode.com/problems/reconstruct-itinerary
178
628Maximum Product of Three Numbers47.1%Easy0.3483066942682158 https://leetcode.com/problems/maximum-product-of-three-numbers
179
1100Find K-Length Substrings With No Repeated Characters72.7%Medium0.3483066942682158 https://leetcode.com/problems/find-k-length-substrings-with-no-repeated-characters
180
13Roman to Integer55.7%Easy0.34754876247610755 https://leetcode.com/problems/roman-to-integer
181
39Combination Sum56.1%Medium0.34653485590252786 https://leetcode.com/problems/combination-sum
182
312Burst Balloons51.8%Hard0.3462131701037017 https://leetcode.com/problems/burst-balloons
183
529Minesweeper59.1%Medium0.3416302106614813 https://leetcode.com/problems/minesweeper
184
1130Minimum Cost Tree From Leaf Values66.1%Medium0.33787755363431937 https://leetcode.com/problems/minimum-cost-tree-from-leaf-values
185
133Clone Graph34.8%Medium0.33670563608545373 https://leetcode.com/problems/clone-graph
186
287Find the Duplicate Number55.5%Medium0.33544722224040363 https://leetcode.com/problems/find-the-duplicate-number
187
333Largest BST Subtree35.8%Medium0.32931497055013925 https://leetcode.com/problems/largest-bst-subtree
188
560Subarray Sum Equals K43.9%Medium0.3271780031910384 https://leetcode.com/problems/subarray-sum-equals-k
189
32Longest Valid Parentheses28.4%Hard0.3269467909737243 https://leetcode.com/problems/longest-valid-parentheses
190
794Valid Tic-Tac-Toe State32.6%Medium0.32676342249425205 https://leetcode.com/problems/valid-tic-tac-toe-state
191
695Max Area of Island62.7%Medium0.32657434158263016 https://leetcode.com/problems/max-area-of-island
192
518Coin Change 250.2%Medium0.32305590883561364 https://leetcode.com/problems/coin-change-2
193
901Online Stock Span60.2%Medium0.3225465062722876 https://leetcode.com/problems/online-stock-span
194
547Friend Circles58.6%Medium0.31641031482435944 https://leetcode.com/problems/friend-circles
195
135Candy31.6%Hard0.3148768941781284 https://leetcode.com/problems/candy
196
102Binary Tree Level Order Traversal54.6%Medium0.3108352169668257 https://leetcode.com/problems/binary-tree-level-order-traversal
197
72Edit Distance44.8%Hard0.30928199098237896 https://leetcode.com/problems/edit-distance
198
41First Missing Positive32.0%Hard0.3088033158177097 https://leetcode.com/problems/first-missing-positive
199
185Department Top Three Salaries34.5%Hard0.3067091029533853 https://leetcode.com/problems/department-top-three-salaries
200
10Regular Expression Matching26.8%Hard0.3026257535192428 https://leetcode.com/problems/regular-expression-matching
201
205Isomorphic Strings39.8%Easy0.30101800626340847 https://leetcode.com/problems/isomorphic-strings
202
854K-Similar Strings38.2%Hard0.3001856330111831 https://leetcode.com/problems/k-similar-strings