My LeetCode Solutions

LeetCode Topics

Math

0007-reverse-integer
0013-roman-to-integer
0069-sqrtx
0231-power-of-two
0258-add-digits
0507-perfect-number
0539-minimum-time-difference
0728-self-dividing-numbers
1013-fibonacci-number
2520-count-the-digits-that-divide-a-number
2752-sum-multiples

Hash Table

0001-two-sum
0013-roman-to-integer
0771-jewels-and-stones
2274-keep-multiplying-found-values-by-two
2351-first-letter-to-appear-twice

String

0013-roman-to-integer
0058-length-of-last-word
0539-minimum-time-difference
0771-jewels-and-stones
2351-first-letter-to-appear-twice

Binary Search

0069-sqrtx
0540-single-element-in-a-sorted-array
1351-count-negative-numbers-in-a-sorted-matrix
2529-maximum-count-of-positive-integer-and-negative-integer

Array

0001-two-sum
0053-maximum-subarray
0136-single-number
0238-product-of-array-except-self
0539-minimum-time-difference
0540-single-element-in-a-sorted-array
0717-1-bit-and-2-bit-characters
0861-flipping-an-image
1351-count-negative-numbers-in-a-sorted-matrix
2102-find-the-middle-index-in-array
2274-keep-multiplying-found-values-by-two
2529-maximum-count-of-positive-integer-and-negative-integer
2798-number-of-employees-who-met-the-target
2876-number-of-employees-who-met-the-target

Sorting

0539-minimum-time-difference
2274-keep-multiplying-found-values-by-two

Database

0175-combine-two-tables
0177-nth-highest-salary
0181-employees-earning-more-than-their-managers
0182-duplicate-emails
0183-customers-who-never-order
0197-rising-temperature
0577-employee-bonus
0584-find-customer-referee
0586-customer-placing-the-largest-number-of-orders
0595-big-countries
0596-classes-more-than-5-students

Bit Manipulation

0136-single-number
0231-power-of-two
0861-flipping-an-image
2351-first-letter-to-appear-twice

Recursion

0231-power-of-two
1013-fibonacci-number

Dynamic Programming

0053-maximum-subarray
1013-fibonacci-number

Memoization

1013-fibonacci-number

Simulation

0258-add-digits
0861-flipping-an-image
2274-keep-multiplying-found-values-by-two

Number Theory

0258-add-digits

Prefix Sum

0238-product-of-array-except-self
2102-find-the-middle-index-in-array

Divide and Conquer

0053-maximum-subarray

Two Pointers

0861-flipping-an-image

Matrix

0861-flipping-an-image
1351-count-negative-numbers-in-a-sorted-matrix

Counting

2351-first-letter-to-appear-twice
2529-maximum-count-of-positive-integer-and-negative-integer