LeetCode Solutions

A collection of my LeetCode solutions in C++, focused on Data Structures & Algorithms (DSA) and problem-solving.

This repository documents my journey of practicing programming problems and improving my algorithmic thinking through hands-on problem solving.

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About This Repository

I am currently a Software Engineering student @ PUCIT, and this repository contains the LeetCode problems I have solved while practicing programming and DSA.

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Problem Index

#	Problem	LeetCode	Solution
1	Two Sum	Problem	0001_two_sum.cpp
3	Longest Substring Without Repeating Characters	Problem	0003_longest_substring_without_repeating_characters.cpp
4	Median of Two Sorted Arrays	Problem	0004_median_of_two_sorted_arrays.cpp
7	Reverse Integer	Problem	0007_reverse_integer.cpp
8	String to Integer (atoi)	Problem	0008_string_to_integer_atoi.cpp
9	Palindrome Number	Problem	0009_palindrome_number.cpp
11	Container With Most Water	Problem	0011_container_with_most_water.cpp
12	Integer to Roman	Problem	0012_integer_to_roman.cpp
13	Roman to Integer	Problem	0013_roman_to_integer.cpp
14	Longest Common Prefix	Problem	0014_longest_common_prefix.cpp
20	Valid Parentheses	Problem	0020_valid_parentheses.cpp
26	Remove Duplicates from Sorted Array	Problem	0026_remove_duplicates_from_sorted_array.cpp
27	Remove Element	Problem	0027_remove_element.cpp
28	Find the Index of the First Occurrence in a String	Problem	0028_find_the_index_of_the_first_occurrence_in_a_string.cpp
33	Search in Rotated Sorted Array	Problem	0033_search_in_rotated_sorted_array.cpp
35	Search Insert Position	Problem	0035_search_insert_position.cpp
50	Pow(x, n)	Problem	0050_powx-n.cpp
53	Maximum Subarray	Problem	0053_maximum_subarray.cpp
58	Length of Last Word	Problem	0058_length_of_last_word.cpp
66	Plus One	Problem	0066_plus_one.cpp
67	Add Binary	Problem	0067_add_binary.cpp
69	Sqrt(x)	Problem	0069_sqrt(x).cpp
70	Climbing Stairs	Problem	0070_climbing_stairs.cpp
88	Merge Sorted Array	Problem	0088_merge_sorted_array.cpp
118	Pascal's Triangle	Problem	0118_pascals_triangle.cpp
119	Pascal's Triangle II	Problem	0119_pascals_triangle_ii.cpp
121	Best Time to Buy and Sell Stock	Problem	0121_best_time_to_buy_and_sell_stock.cpp
125	Valid Palindrome	Problem	0125_valid_palindrome.cpp
136	Single Number	Problem	0136_single_number.cpp
168	Excel Sheet Column Title	Problem	0168_excel_sheet_column_title.cpp
169	Majority Element	Problem	0169_majority_element.cpp
171	Excel Sheet Column Number	Problem	0171_excel_sheet_column_number.cpp
191	Number of 1 Bits	Problem	0191_number_of_1_bits.cpp
202	Happy Number	Problem	0202_happy_number.cpp
217	Contains Duplicate	Problem	0217_contains_duplicate.cpp
231	Power of Two	Problem	0231_power_of_two.cpp
238	Product of Array Except Self	Problem	0238_product_of_array_except_self.cpp
242	Valid Anagram	Problem	0242_valid_anagram.cpp
258	Add Digits	Problem	0258_add_digits.cpp
263	Ugly Number	Problem	0263_ugly_number.cpp
268	Missing Number	Problem	0268_missing_number.cpp
283	Move Zeroes	Problem	0283_move_zeroes.cpp
326	Power of Three	Problem	0326_power_of_three.cpp
338	Counting Bits	Problem	0338_counting_bits.cpp
342	Power of Four	Problem	0342_power_of_four.cpp
344	Reverse String	Problem	0344_reverse_string.cpp
349	Intersection of Two Arrays	Problem	0349_intersection_of_two_arrays.cpp
367	Valid Perfect Square	Problem	0367_valid_perfect_square.cpp
389	Find the Difference	Problem	0389_find_the_difference.cpp
412	Fizz Buzz	Problem	0412_fizz_buzz.cpp
415	Add Strings	Problem	0415_add_strings.cpp
441	Arranging Coins	Problem	0441_arranging_coins.cpp
476	Number Complement	Problem	0476_number_complement.cpp
485	Max Consecutive Ones	Problem	0485_max_consecutive_ones.cpp
504	Base 7	Problem	0504_base_7.cpp
507	Perfect Number	Problem	0507_perfect_number.cpp
509	Fibonacci Number	Problem	0509_fibonacci_number.cpp
520	Detect Capital	Problem	0520_detect_capital.cpp
599	Minimum Index Sum of Two Lists	Problem	0599_minimum_index_sum_of_two_lists.cpp
657	Robot Return to Origin	Problem	0657_robot_return_to_origin.cpp
728	Self Dividing Numbers	Problem	0728_self_dividing_numbers.cpp
806	Number of Lines To Write String	Problem	0806_number_of_lines_to_write_string.cpp
867	Transpose Matrix	Problem	0867_transpose_matrix.cpp
977	Squares of a Sorted Array	Problem	0977_squares_of_a_sorted_array.cpp
989	Add to Array-Form of Integer	Problem	0989_add_to_array_form_of_integer.cpp
1342	Number of Steps to Reduce a Number to Zero	Problem	1342_number_of_steps_to_reduce_a_number_to_zero.cpp
1346	Check If N and Its Double Exist	Problem	1346_check_if_n_and_its_double_exist.cpp
1446	Consecutive Characters	Problem	1446_consecutive_characters.cpp
1528	Shuffle String	Problem	1528_shuffle_string.cpp
1629	Slowest Key	Problem	1629_slowest_key.cpp
1672	Richest Customer Wealth	Problem	1672_richest_customer_wealth.cpp
1688	Count of Matches in Tournament	Problem	1688_count_of-matches_in_tournament.cpp
1945	Sum of Digits of String After Convert	Problem	1945_sum_of_digits_of_string_after_convert.cpp
2119	A Number After a Double Reversal	Problem	2119_a_number_after_a_double_reversal.cpp
2154	Keep Multiplying Found Values by Two	Problem	2154_keep_multiplying_found_values_by_two.cpp
2235	Add Two Integers	Problem	2235_add_two_integers.cpp
2413	Smallest Even Multiple	Problem	2413_smallest_even_multiple.cpp
2427	Number of Common Factors	Problem	2427_number_of_common_factors.cpp
2455	Average Value of Even Numbers That Are Divisible by Three	Problem	2455_average_value_of_even_numbers_that_are_divisible_by_three.cpp
2643	Row With Maximum Ones	Problem	2643_row_with_maximum_ones.cpp
2778	Sum of Squares of Special Elements	Problem	2778_sum_of_squares_of_special_elements.cpp
3345	Smallest Divisible Digit Product I	Problem	3345_smallest_divisible_digit_product_i.cpp
3678	Smallest Absent Positive Greater Than Average	Problem	3678_smallest_absent_positive_greater_than_average.cpp

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Code Checking

Use code_check.cpp to test solutions locally.

g++ code_check.cpp
.\a.exe

Replace the solution and test case in code_check.cpp as needed.

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Note

These solutions represent my own learning and problem-solving practice and may not always be the most optimal.

The goal is to understand the problem, develop a working approach, analyze it, and improve over time.

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More problems and solutions will be added as I continue my coding journey.