Hello World

LeetCode Topics

Tree

0988-flip-equivalent-binary-trees
2545-height-of-binary-tree-after-subtree-removal-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Breadth-First Search

2545-height-of-binary-tree-after-subtree-removal-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Sorting

0217-contains-duplicate
0242-valid-anagram
1184-car-pooling
2646-kth-largest-sum-in-a-binary-tree
3291-find-if-array-can-be-sorted

Binary Tree

0988-flip-equivalent-binary-trees
2545-height-of-binary-tree-after-subtree-removal-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

String

0013-roman-to-integer
0242-valid-anagram
0290-word-pattern
0551-student-attendance-record-i
0812-rotate-string
1197-parsing-a-boolean-expression
1302-delete-characters-to-make-fancy-string
1350-remove-sub-folders-from-the-filesystem
1667-find-kth-bit-in-nth-binary-string
1715-split-a-string-into-the-max-number-of-unique-substrings
1797-goal-parser-interpretation
2580-circular-sentence
2727-number-of-senior-citizens

Recursion

0002-add-two-numbers
1197-parsing-a-boolean-expression
1667-find-kth-bit-in-nth-binary-string

Simulation

1184-car-pooling
1667-find-kth-bit-in-nth-binary-string

Stack

1197-parsing-a-boolean-expression

Hash Table

0001-two-sum
0013-roman-to-integer
0036-valid-sudoku
0217-contains-duplicate
0242-valid-anagram
0290-word-pattern
0523-continuous-subarray-sum
0797-rabbits-in-forest
1500-count-largest-group
1715-split-a-string-into-the-max-number-of-unique-substrings
2677-cousins-in-binary-tree-ii

Backtracking

1715-split-a-string-into-the-max-number-of-unique-substrings

Linked List

0002-add-two-numbers

Math

0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0013-roman-to-integer
0523-continuous-subarray-sum
0797-rabbits-in-forest
1500-count-largest-group
2106-find-greatest-common-divisor-of-array
3704-count-partitions-with-even-sum-difference

Array

0001-two-sum
0036-valid-sudoku
0136-single-number
0209-minimum-size-subarray-sum
0217-contains-duplicate
0303-range-sum-query-immutable
0304-range-sum-query-2d-immutable
0523-continuous-subarray-sum
0724-find-pivot-index
0797-rabbits-in-forest
1184-car-pooling
1206-corporate-flight-bookings
1350-remove-sub-folders-from-the-filesystem
2102-find-the-middle-index-in-array
2106-find-greatest-common-divisor-of-array
2545-height-of-binary-tree-after-subtree-removal-queries
2727-number-of-senior-citizens
3291-find-if-array-can-be-sorted
3704-count-partitions-with-even-sum-difference
3731-sum-of-variable-length-subarrays

Depth-First Search

0988-flip-equivalent-binary-trees
1350-remove-sub-folders-from-the-filesystem
2545-height-of-binary-tree-after-subtree-removal-queries
2677-cousins-in-binary-tree-ii

Trie

1350-remove-sub-folders-from-the-filesystem

String Matching

0812-rotate-string

Bit Manipulation

0136-single-number
3291-find-if-array-can-be-sorted

Matrix

0036-valid-sudoku
0304-range-sum-query-2d-immutable

Design

0303-range-sum-query-immutable
0304-range-sum-query-2d-immutable

Prefix Sum

0209-minimum-size-subarray-sum
0303-range-sum-query-immutable
0304-range-sum-query-2d-immutable
0523-continuous-subarray-sum
0724-find-pivot-index
1184-car-pooling
1206-corporate-flight-bookings
2102-find-the-middle-index-in-array
3704-count-partitions-with-even-sum-difference
3731-sum-of-variable-length-subarrays

Binary Search

0209-minimum-size-subarray-sum

Sliding Window

0209-minimum-size-subarray-sum

Greedy

0797-rabbits-in-forest

Number Theory

2106-find-greatest-common-divisor-of-array

Heap (Priority Queue)

1184-car-pooling