LeetCode

• Last Updated: Jun/1/2024

Progress

• Solved: 203/3173 (5.83%)
• Easy: 75/800 (8.89%)
• Medium: 116/1666 (5.94%)
• Hard: 18/707 (2.12%)

Problem

#	Problems	Difficulty	C++	Python
4	Median of Two Sorted Arrays	Hard	cpp
20	Valid Parentheses	Easy	cpp
26	Remove Duplicates from Sorted Array	Easy	cpp
29	Divide Two Integers	Medium	cpp
33	Search in Rotated Sorted Array	Medium		py
34	Find First and Last Position of Element in Sorted Array	Medium	cpp
49	Group Anagrams	Medium		py
51	N-Queens	Hard	cpp
53	Maximum Subarray	Medium	cpp	py
55	Jump Game	Medium		py
64	Minimum Path Sum	Medium		py
69	Sqrt(x)	Easy	cpp
75	Sort Colors	Medium	cpp
78	Subsets	Medium	cpp
79	Word Search	Medium	cpp
122	Best Time to Buy and Sell Stock II	Medium		py
129	Sum Root to Leaf Numbers	Medium	💽: O(H) 💽: O(1)
136	Single Number	Easy		py
146	LRU Cache	Medium		py (not O(1))
153	Find Minimum in Rotated Sorted Array	Medium	cpp
155	Min Stack	Medium		py
159	Longest Substring with At Most Two Distinct Characters	Medium	cpp
162	Find Peak Element	Medium	cpp
198	House Robber	Medium	cpp
200	Number of Islands	Medium	cpp	py
201	Bitwise AND of Numbers Range	Medium		py
202	Happy Number	Easy		py
204	Count Primes	Medium	cpp
207	Course Schedule	Medium	cpp
208	Implement Trie (Prefix Tree)	Medium	cpp
210	Course Schedule II	Medium	cpp
238	Product of Array Except Self	Medium		py
278	First Bad Version	Easy	cpp
283	Move Zeroes	Easy	cpp	py
300	Longest Increasing Subsequence	Medium	cpp
304	Range Sum Query 2D - Immutable	Medium	cpp
310	Minimum Height Trees	Medium	cpp
330	Patching Array	Hard	cpp
340	Longest Substring with At Most K Distinct Characters	Medium	cpp
344	Reverse String	Easy	cpp
374	Guess Number Higher or Lower	Easy	cpp
399	Evaluate Division	Medium	cpp
402	Remove K Digits	Medium	cpp
404	Sum of Left Leaves	Easy	💽: O(N) 💽: O(1)
409	Longest Palindrome	Easy	cpp
463	Island Perimeter	Easy	cpp
476	Number Complement	Easy		py
502	IPO	Hard	cpp
514	Freedom Trail	Hard	cpp
523	Continuous Subarray Sum	Medium	cpp
543	Diameter of Binary Tree	Easy		py
547	Number of Provinces	Medium	cpp
560	Subarray Sum Equals K	Medium		py
623	Add One Row to Tree	Medium	cpp
648	Replace Words	Medium	cpp
658	Find K Closest Elements	Medium	cpp
678	Valid Parenthesis String	Medium	cpp
704	Binary Search	Easy	cpp
739	Daily Temperatures	Medium	cpp
743	Network Delay Time	Medium	cpp
752	Open the Lock	Medium	cpp
771	Jewels and Stones	Easy		py
844	Backspace String Compare	Easy		py
846	Hand of Straights	Medium	cpp
876	Middle of the Linked List	Easy		py
945	Minimum Increment to Make Array Unique	Medium	cpp
974	Subarray Sums Divisible by K	Medium	cpp
988	Smallest String Starting From Leaf	Medium	💽: O(N2) 💽: O(N)
995	Minimum Number of K Consecutive Bit Flips	Hard	cpp
1002	Find Common Characters	Easy	cpp
1008	Construct Binary Search Tree from Preorder Traversal	Medium		py
1046	Last Stone Weight	Easy		py
1051	Height Checker	Easy	cpp
1112	Relative Sort Array	Easy	cpp
1137	N-th Tribonacci Number	Easy	cpp
1143	Longest Common Subsequence	Medium		py
1197	Minimum Knight Moves	Medium	O(N2) O(1)
1202	Smallest String With Swaps	Medium	cpp
1203	Sort Items by Groups Respecting Dependencies	Hard	cpp
1249	Minimum Remove to Make Valid Parentheses	Medium	cpp
1289	Minimum Falling Path Sum II	Hard	cpp
1296	Divide Array in Sets of K Consecutive Numbers	Medium	cpp
1351	Count Negative Numbers in a Sorted Matrix	Easy		py
1356	Sort Integers by The Number of 1 Bits	Easy		py
1357	Apply Discount Every n Orders	Medium		py
1360	Number of Days Between Two Dates	Easy		py
1365	How Many Numbers Are Smaller Than the Current Number	Easy		py
1366	Rank Teams by Votes	Medium		py
1374	Generate a String With Characters That Have Odd Counts	Easy		py
1394	Find Lucky Integer in an Array	Easy		py
1395	Count Number of Teams	Medium		py
1396	Design Underground System	Medium		py
1399	Count Largest Group	Easy		py
1400	Construct K Palindrome Strings	Medium		py
1401	Circle and Rectangle Overlapping	Medium		py
1402	Reducing Dishes	Hard		py
1403	Minimum Subsequence in Non-Increasing Order	Easy		py
1404	Number of Steps to Reduce a Number in Binary Representation to One	Medium		py
1408	String Matching in an Array	Easy		py
1409	Queries on a Permutation With Key	Medium		py
1410	HTML Entity Parser	Medium		py
1413	Minimum Value to Get Positive Step by Step Sum	Easy		py
1414	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K	Medium		py
1415	The k-th Lexicographical String of All Happy Strings of Length n	Medium		py
1416	Restore The Array	Hard		py
1417	Reformat The String	Easy		py
1418	Display Table of Food Orders in a Restaurant	Medium		py
1419	Minimum Number of Frogs Croaking	Medium		py
1422	Maximum Score After Splitting a String	Easy		py
1423	Maximum Points You Can Obtain from Cards	Medium		py
1424	Diagonal TraverseII	Medium		py
1425	Constrained Subset Sum	Hard		py
1426	Counting Elements	Easy		py
1427	Perform String Shifts	Easy		py
1428	Leftmost Column with at Least a One	Medium		py
1431	Kids With the Greatest Number of Candies	Easy		py
1432	Max Difference You Can Get From Changing an Integer	Medium		py
1433	Check If a String Can Break Another String	Medium		py
1436	Destination City	Easy		py
1437	Check If All 1's Are at Least Length K Places Away	Easy		py
1461	Check If a String Contains All Binary Codes of Size K	Medium	cpp
1480	Running Sum of 1d Array	Easy	cpp
1544	Make The String Great	Easy	cpp
1552	Magnetic Force Between Two Balls	Medium	cpp
1553	Find the Winner of an Array Game	Medium	cpp
1564	Put Boxes Into the Warehouse I	Medium	cpp
1580	Put Boxes Into the Warehouse II	Medium	cpp
1700	Number of Students Unable to Eat Lunch	Easy	cpp
1857	Largest Color Value in a Directed Graph	Hard	cpp
1915	Number of Wonderful Substrings	Medium	cpp
1940	Longest Common Subsequence Between Sorted Arrays	Medium	cpp
1971	Find if Path Exists in Graph	Easy	cpp
1992	Find All Groups of Farmland	Medium	cpp
2037	Minimum Number of Moves to Seat Everyone	Easy	cpp
2073	Time Needed to Buy Tickets	Easy	cpp
2083	Substrings That Begin and End With the Same Letter	Medium	cpp
2192	All Ancestors of a Node in a Directed Acyclic Graph	Medium	⌛: O(N2+N*E) 💽: O(N+E) ⌛💽: O(N2+E)
2236	Add Two Integers	Easy	cpp
2293	Min Max Game	Easy	cpp
2294	Partition Array Such That Maximum Difference Is K	Medium	cpp
2295	Replace Elements in an Array	Medium	cpp
2296	Design a Text Editor	Hard	cpp
2299	Strong Password Checker II	Easy	cpp
2302	Count Subarrays With Score Less Than K	Hard	cpp
2303	Calculate Amount Paid in Taxes	Easy	cpp
2304	Minimum Path Cost in a Grid	Medium	cpp
2309	Greatest English Letter in Upper and Lower Case	Easy	cpp
2310	Sum of Numbers With Units Digit K	Medium	cpp
2315	Count Asterisks	Easy	cpp
2316	Count Unreachable Pairs of Nodes in an Undirected Graph	Medium	cpp
2317	Maximum XOR After Operations	Medium	cpp
2335	Minimum Amount of Time to Fill Cups	Easy	cpp
2336	Smallest Number in Infinite Set	Medium	cpp
2347	Best Poker Hand	Easy	cpp
2348	Number of Zero-Filled Subarrays	Medium	cpp
2349	Design a Number Container System	Medium	cpp
2363	Merge Similar Items	Easy	cpp
2364	Count Number of Bad Pairs	Medium	cpp
2365	Task Scheduler II	Medium	cpp
2366	Minimum Replacements to Sort the Array	Hard	cpp
2367	Number of Arithmetic Triplets	Easy	cpp
2379	Minimum Recolors to Get K Consecutive Black Blocks	Easy	cpp
2381	Shifting Letters II	Medium	cpp
2389	Longest Subsequence With Limited Sum	Easy	cpp
2390	Removing Stars From a String	Medium	cpp
2391	Minimum Amount of Time to Collect Garbage	Medium	cpp
2395	Find Subarrays With Equal Sum	Easy	cpp
2396	Strictly Palindromic Number	Medium	cpp
2399	Check Distances Between Same Letters	Easy	cpp
2404	Most Frequent Even Element	Easy	cpp
2405	Optimal Partition of String	Medium	cpp
2413	Smallest Even Multiple	Easy	cpp
2414	Length of the Longest Alphabetical Continuous Substring	Medium	cpp
2415	Reverse Odd Levels of Binary Tree	Medium	cpp
2427	Number of Common Factors	Easy	cpp
2429	Minimize XOR	Medium	cpp
2432	The Employee That Worked on the Longest Task	Easy	cpp
2433	Find The Original Array of Prefix Xor	Medium	cpp
2437	Number of Valid Clock Times	Easy	cpp
2438	Range Product Queries of Powers	Medium	cpp
2455	Average Value of Even Numbers That Are Divisible by Three	Easy	cpp
2456	Most Popular Video Creator	Medium	cpp
2457	Minimum Addition to Make Integer Beautiful	Medium	cpp
2460	Apply Operations to an Array	Easy	cpp
2461	Maximum Sum of Distinct Subarrays With Length K	Medium	cpp
2462	Total Cost to Hire K Workers	Medium	cpp
2469	Convert the Temperature	Easy	cpp
2470	Number of Subarrays With LCM Equal to K	Medium	cpp
2471	Minimum Number of Operations to Sort a Binary Tree by Level	Medium	cpp
2485	Find the Pivot Integer	Easy	cpp
2486	Append Characters to String to Make Subsequence	Medium	cpp
2487	Remove Nodes From Linked List	Medium	cpp
2997	Minimum Number of Operations to Make Array XOR Equal to K	Medium	cpp
3105	Longest Strictly Increasing or Strictly Decreasing Subarray	Easy	cpp
3106	Lexicographically Smallest String After Operations With Constraint	Medium	cpp
3107	Minimum Operations to Make Median of Array Equal to K	Medium	cpp
3108	Minimum Cost Walk in Weighted Graph	Hard	cpp
3110	Score of a String	Easy	cpp
3114	Latest Time You Can Obtain After Replacing Characters	Easy	cpp
3115	Maximum Prime Difference	Medium	cpp
3116	Kth Smallest Amount With Single Denomination Combination	Hard	cpp
3120	Count the Number of Special Characters I	Easy	cpp
3121	Count the Number of Special Characters II	Medium	cpp
3122	Minimum Number of Operations to Satisfy Conditions	Medium	cpp
3123	Find Edges in Shortest Paths	Hard	cpp
3131	Find the Integer Added to Array I	Easy	cpp
3132	Find the Integer Added to Array II	Medium	cpp
3133	Minimum Array End	Medium	cpp
3174	Clear Digits	Easy	cpp
3175	Find The First Player to win K Games in a Row	Medium	cpp

See Also

• https://github.com/NDR0216/HackerRank