🧩 LeetCode Solutions by Hardik Runwal

This repository contains my solutions to various LeetCode problems.
All solutions are written in a clean, easy-to-understand style — some in Python, some in Java, depending on the problem.

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📚 Index of Solutions

#	Question ID	Question Name	Problem	Solution
1	1	1 Two Sum	Problem	two-sum.java
2	1	1 Two Sum Cpp	Problem	two-sum.cpp two-sum.py
3	100	100 Same Tree	Problem	same-tree.py
4	104	104 Maximum Depth Of Binary Tree	Problem	maximum-depth-of-binary-tree.py
5	1064	1064 Smallest Integer Divisible By K	Problem	smallest-integer-divisible-by-k.py
6	1071	1071 Binary Prefix Divisible By 5	Problem	-
7	108	108 Convert Sorted Array To Binary Search Tree	Problem	convert-sorted-array-to-binary-search-tree.cpp
8	11	11 Container With Most Water	Problem	container-with-most-water.py
9	1127	1127 Last Stone Weight	Problem	last-stone-weight.cpp
10	118	118 Pascal'Striangle	-	View Code
11	1205	1205 Defanging An Ip Address	Problem	defanging-an-ip-address.py
12	121	121 Best Time To Buy And Sell Stock	Problem	best-time-to-buy-and-sell-stock.java
13	121	121 Best Time To Buy And Sell Stock Py	Problem	best-time-to-buy-and-sell-stock.py
14	125	125 Validpalindrome	-	View Code
15	1266	1266 Minimumtimevisitingallpoints	-	View Code
16	1353	1353 Find Resultant Array After Removing Anagrams	Problem	find-resultant-array-after-removing-anagrams.java find-resultant-array-after-removing-anagrams.py
17	136	136 Single Number	Problem	single-number.java
18	1365	1365 Howmanynumbersaresmallerthanthecurrentnumber	-	View Code
19	1388	1388 Greatest Sum Divisible By Three	Problem	greatest-sum-divisible-by-three.py
20	1395	1395 Minimum Time Visiting All Points	Problem	minimum-time-visiting-all-points.cpp
21	13	13 Romantointeger	-	View Code
22	1402	1402 Count Square Submatrices With All Ones	Problem	count-square-submatrices-with-all-ones.py
23	141	141 Linked List Cycle	Problem	-
24	142	142 Linked List Cycle Ii	Problem	-
25	143	143 Reorder List	Problem	-
26	144	144 Binary Tree Preorder Traversal	Problem	-
27	1440	1440 Convert Integer To The Sum Of Two No Zero Integers	Problem	convert-integer-to-the-sum-of-two-no-zero-integers.py
28	1448	1448 Maximum 69 Number	Problem	maximum-69-number.py
29	148	148 Sort List	Problem	-
30	1482	1482 How Many Numbers Are Smaller Than The Current Number	Problem	how-many-numbers-are-smaller-than-the-current-number.cpp
31	149	149 Max Points On A Line	Problem	max-points-on-a-line.py
32	14	14 Longestcommonprefix	-	View Code
33	15	15 3Sum	Problem	3sum.py
34	150	150 Evaluatereversepolishnotation	-	View Code
35	153	153 Find Minimum In Rotated Sorted Array	Problem	find-minimum-in-rotated-sorted-array.py
36	1552	1552 Build An Array With Stack Operations	Problem	build-an-array-with-stack-operations.cpp
37	155	155 Minstack	-	View Code
38	1570	1570 Final Prices With A Special Discount In A Shop	Problem	-
39	1580	1580 Shuffle The Array	Problem	shuffle-the-array.cpp
40	160	160 Intersection Of Two Linked Lists	Problem	-
41	1603	1603 Running Sum Of 1D Array	Problem	running-sum-of-1d-array.py
42	1635	1635 Number Of Good Pairs	Problem	number-of-good-pairs.py
43	167	167 Twosum Ii Inputarrayissorted	-	View Code
44	169	169 Majority Element	Problem	majority-element.java
45	172	172 Factorialtrailingzeroes	-	View Code
46	1742	1742 Widest Vertical Area Between Two Points Containing No Points	Problem	widest-vertical-area-between-two-points-containing-no-points.py
47	1791	1791 Richest Customer Wealth	Problem	richest-customer-wealth.py
48	1797	1797 Goal Parser Interpretation	Problem	goal-parser-interpretation.py
49	17	17 Lettercombinationsofaphonenumber	-	View Code
50	1802	1802 Number Of Students Unable To Eat Lunch	Problem	number-of-students-unable-to-eat-lunch.cpp
51	1806	1806 Count Of Matches In Tournament	Problem	count-of-matches-in-tournament.py
52	1817	1817 Calculate Money In Leetcode Bank	Problem	calculate-money-in-leetcode-bank.py
53	189	189 Rotate Array	Problem	rotate-array.py
54	1894	1894 Merge Strings Alternately	Problem	merge-strings-alternately.cpp
55	1895	1895 Minimum Number Of Operations To Move All Balls To Each Box	Problem	minimum-number-of-operations-to-move-all-balls-to-each-box.py
56	19	19 Remove Nth Node From End Of List	Problem	-
57	1	1 Twosum	-	View Code
58	2	2 Add Two Numbers	Problem	-
59	20	20 Valid Parentheses	Problem	valid-parentheses.py
60	202	202 Happy Number	Problem	happy-number.py
61	2037	2037 Count Square Sum Triples	Problem	count-square-sum-triples.py
62	2048	2048 Build Array From Permutation	Problem	build-array-from-permutation.py
63	205	205 Isomorphic Strings	Problem	isomorphic-strings.py
64	2050	2050 Count Good Numbers	Problem	count-good-numbers.py
65	2058	2058 Concatenation Of Array	Problem	-
66	206	206 Reverse Linked List	Problem	-
67	20	20 Validparentheses	-	View Code
68	2137	2137 Final Value Of Variable After Performing Operations	Problem	final-value-of-variable-after-performing-operations.py
69	217	217 Containsduplicates	-	View Code
70	2195	2195 Time Needed To Buy Tickets	Problem	time-needed-to-buy-tickets.cpp
71	21	21 Mergetwosortedlists	-	View Code
72	2216	2216 Delete The Middle Node Of A Linked List	Problem	-
73	2219	2219 Maximum Number Of Words Found In Sentences	Problem	maximum-number-of-words-found-in-sentences.py
74	223	223 Rectangle Area	Problem	rectangle-area.py
75	2244	2244 Number Of Laser Beams In A Bank	Problem	number-of-laser-beams-in-a-bank.py
76	2264	2264 Largest3Samedigitnumberinstring	-	View Code
77	2265	2265 Partition Array According To Given Pivot	Problem	partition-array-according-to-given-pivot.py
78	2271	2271 Rearrange Array Elements By Sign	Problem	rearrange-array-elements-by-sign.java
79	2274	2274 Keep Multiplying Found Values By Two	Problem	keep-multiplying-found-values-by-two.py
80	229	229 Majority Element Ii	Problem	majority-element-ii.py
81	232	232 Implement Queue Using Stacks	Problem	implement-queue-using-stacks.cpp
82	234	234 Palindrome Linked List	Problem	-
83	237	237 Delete Node In A Linked List	Problem	-
84	238	238 Product Of Array Except Self	Problem	product-of-array-except-self.py
85	238	238 Productofarrayexceptself	-	View Code
86	2396	2396 Strictlypalindromicnumber	-	View Code
87	2423	2423 Removelettertoequalizefrequency	-	View Code
88	242	242 Validanagram	-	View Code
89	2491	2491 Smallest Even Multiple	Problem	smallest-even-multiple.py
90	2556	2556 Convert The Temperature	Problem	convert-the-temperature.py
91	2591	2591 Distributemoneytomaximumchildren	-	View Code
92	26	26 Remove Duplicates From Sorted Array	Problem	remove-duplicates-from-sorted-array.py
93	2631	2631 Sort The Students By Their Kth Score	Problem	sort-the-students-by-their-kth-score.py
94	268	268 Missingnumbers	-	View Code
95	27	27 Remove Element	Problem	remove-element.java
96	2714	2714 Left And Right Sum Differences	Problem	left-and-right-sum-differences.py
97	2724	2724 Convert An Array Into A 2D Array With Conditions	Problem	convert-an-array-into-a-2d-array-with-conditions.py
98	28	28 Find The Index Of The First Occurrence In A String	Problem	find-the-index-of-the-first-occurrence-in-a-string.py
99	2812	2812 Find The Maximum Achievable Number	Problem	find-the-maximum-achievable-number.py
100	283	283 Move Zeroes	Problem	move-zeroes.java
101	2894	2894 Divisibleandnondivisiblesumsdifference	-	View Code
102	29	29 Divide Two Integers	Problem	divide-two-integers.py
103	2903	2903 Insert Greatest Common Divisors In Linked List	Problem	-
104	2917	2917 Count Pairs Whose Sum Is Less Than Target	Problem	count-pairs-whose-sum-is-less-than-target.py
105	31	31 Next Permutation	Problem	next-permutation.py
106	3110	3110 Scoreofastring	-	View Code
107	312	312 Burst Balloons	Problem	burst-balloons.py
108	3194	3194 Find Words Containing Character	Problem	find-words-containing-character.py
109	324	324 Wigglesortii	-	View Code
110	3251	3251 Maximum Area Of Longest Diagonal Rectangle	Problem	maximum-area-of-longest-diagonal-rectangle.java
111	328	328 Odd Even Linked List	Problem	-
112	33	33 Search In Rotated Sorted Array	Problem	search-in-rotated-sorted-array.py
113	3371	3371 Harshad Number	Problem	harshad-number.py
114	34	34 Find First And Last Position Of Element In Sorted Array	Problem	find-first-and-last-position-of-element-in-sorted-array.py
115	342	342 Power Of Four	Problem	power-of-four.py
116	342	342 Poweroffour	-	View Code
117	3446	3446 Find The Number Of Good Pairs I	Problem	find-the-number-of-good-pairs-i.py
118	3476	3476 Find Minimum Operations To Make All Elements Divisible By Three	Problem	find-minimum-operations-to-make-all-elements-divisible-by-three.py
119	347	347 Topkfrequentelements	-	View Code
120	3567	3567 Convert Date To Binary	Problem	convert-date-to-binary.py
121	3581	3581 The Two Sneaky Numbers Of Digitville	Problem	the-two-sneaky-numbers-of-digitville.py
122	3582	3582 Find Indices Of Stable Mountains	Problem	find-indices-of-stable-mountains.py
123	373	373 Find K Pairs With Smallest Sums	Problem	find-k-pairs-with-smallest-sums.cpp
124	3748	3748 Sort Matrix By Diagonals	Problem	sort-matrix-by-diagonals.java
125	3778	3778 Transform Array By Parity	Problem	transform-array-by-parity.py
126	3811	3811 Reverse Degree Of A String	Problem	reverse-degree-of-a-string.py
127	3830	3830 Find Closest Person	Problem	find-closest-person.py
128	4008	4008 Restore Finishing Order	Problem	restore-finishing-order.py
129	4058	4058 Compute Alternating Sum	Problem	compute-alternating-sum.py
130	4080	4080 Smallest Missing Multiple Of K	Problem	smallest-missing-multiple-of-k.py
131	42	42 Trapping Rain Water	Problem	trapping-rain-water.py
132	448	448 Find All Numbers Disappeared In An Array	Problem	find-all-numbers-disappeared-in-an-array.cpp
133	451	451 Sort Characters By Frequency	Problem	sort-characters-by-frequency.py
134	455	455 Assign Cookies	Problem	assign-cookies.py
135	48	48 Rotate Image	Problem	rotate-image.java
136	485	485 Max Consecutive Ones	Problem	max-consecutive-ones.py
137	49	49 Groupanagrams	-	View Code
138	5	5 Longest Palindromic Substring	Problem	longest-palindromic-substring.py
139	50	50 Pow	X,N	-
140	53	53 Maximum Subarray	Problem	maximum-subarray.java
141	54	54 Spiralmatrix	-	View Code
142	56	56 Merge Intervals	Problem	merge-intervals.py
143	560	560 Subarray Sum Equals K	Problem	subarray-sum-equals-k.py
144	58	58 Length Of Last Word	Problem	length-of-last-word.py
145	5	5 Longestpalindromicsubstring	-	View Code
146	60	60 Permutation Sequence	Problem	permutation-sequence.py
147	636	636 Exclusive Time Of Functions	Problem	exclusive-time-of-functions.cpp
148	645	645 Set Mismatch	Problem	set-mismatch.cpp
149	65	65 Validnumber	-	View Code
150	66	66 Plus One	Problem	plus-one.py
151	68	68 Text Justification	Problem	text-justification.java
152	69	69 Sqrtx	Problem	sqrtx.py
153	7	7 Reverse Integer	Problem	reverse-integer.py
154	73	73 Set Matrix Zeroes	Problem	set-matrix-zeroes.java
155	739	739 Daily Temperatures	Problem	daily-temperatures.cpp
156	74	74 Search A 2D Matrix	Problem	search-a-2d-matrix.py
157	75	75 Sort Colors	Problem	sort-colors.java
158	78	78 Subsets	Problem	subsets.py
159	782	782 Jewels And Stones	Problem	-
160	8	8 String To Integer Atoi	Problem	string-to-integer-atoi.py
161	808	808 Soupservings	-	View Code
162	825	825 Max Increase To Keep City Skyline	Problem	max-increase-to-keep-city-skyline.py
163	84	84 Largest Rectangle In Histogram	Problem	largest-rectangle-in-histogram.cpp
164	867	867 New 21 Game	Problem	new-21-game.py
165	869	869 Reorderedpowerof2	-	View Code
166	88	88 Merge Sorted Array	Problem	merge-sorted-array.py
167	9	9 Palindrome Number	Problem	palindrome-number.cpp
168	907	907 Koko Eating Bananas	Problem	koko-eating-bananas.py
169	908	908 Middle Of The Linked List	Problem	-
170	908	908 Middle Of The Linked List Cpp	Problem	middle-of-the-linked-list.cpp
171	909	909 Stone Game	Problem	stone-game.java
172	90	90 Subsetsii	-	View Code
173	93	93 Restore Ip Addresses	Problem	restore-ip-addresses.cpp
174	932	932 Monotonic Array	Problem	monotonic-array.java
175	9	9 Palindromenumber	-	View Code
176	-	Solutions	-	-

(Click on View Code to open the file in GitHub.)

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🚀 How to Use

1. Clone the repository

   git clone https://github.com/HardikLovesTech/LeetCodeSolutions.git