LeetCode Topics

Array

0001-two-sum
0014-longest-common-prefix
0118-pascals-triangle
0136-single-number
0898-transpose-matrix
1019-squares-of-a-sorted-array
1482-how-many-numbers-are-smaller-than-the-current-number
1603-running-sum-of-1d-array
1791-richest-customer-wealth
2132-convert-1d-array-into-2d-array

Hash Table

0001-two-sum
0013-roman-to-integer
0389-find-the-difference
1482-how-many-numbers-are-smaller-than-the-current-number

Math

0009-palindrome-number
0013-roman-to-integer
0067-add-binary
0258-add-digits
0326-power-of-three
0342-power-of-four
0412-fizz-buzz
0507-perfect-number
1440-convert-integer-to-the-sum-of-two-no-zero-integers
1444-number-of-steps-to-reduce-a-number-to-zero
1610-xor-operation-in-an-array
1630-count-odd-numbers-in-an-interval-range

Two Pointers

0028-find-the-index-of-the-first-occurrence-in-a-string
0125-valid-palindrome
1019-squares-of-a-sorted-array

String

0013-roman-to-integer
0014-longest-common-prefix
0020-valid-parentheses
0028-find-the-index-of-the-first-occurrence-in-a-string
0058-length-of-last-word
0067-add-binary
0125-valid-palindrome
0389-find-the-difference
0412-fizz-buzz
0742-to-lower-case

String Matching

0028-find-the-index-of-the-first-occurrence-in-a-string

Bit Manipulation

0067-add-binary
0136-single-number
0191-number-of-1-bits
0342-power-of-four
0389-find-the-difference
1444-number-of-steps-to-reduce-a-number-to-zero
1610-xor-operation-in-an-array

Divide and Conquer

0191-number-of-1-bits

Simulation

0067-add-binary
0258-add-digits
0412-fizz-buzz
0898-transpose-matrix
2132-convert-1d-array-into-2d-array

Number Theory

0258-add-digits

Prefix Sum

1603-running-sum-of-1d-array

Matrix

0898-transpose-matrix
1791-richest-customer-wealth
2132-convert-1d-array-into-2d-array

Recursion

0326-power-of-three
0342-power-of-four

Sorting

0389-find-the-difference
1019-squares-of-a-sorted-array
1482-how-many-numbers-are-smaller-than-the-current-number

Counting Sort

1482-how-many-numbers-are-smaller-than-the-current-number

Dynamic Programming

0118-pascals-triangle

Trie

0014-longest-common-prefix

Stack

0020-valid-parentheses