Leetcode-questions

LeetCode Topics

Array

0001-two-sum
0048-rotate-image
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0153-find-minimum-in-rotated-sorted-array
0542-01-matrix
0705-design-hashset
0733-flood-fill
0845-longest-mountain-in-array
0867-transpose-matrix
0994-rotting-oranges
1299-replace-elements-with-greatest-element-on-right-side
1346-check-if-n-and-its-double-exist
1394-find-lucky-integer-in-an-array
1475-final-prices-with-a-special-discount-in-a-shop
1732-find-the-highest-altitude
1748-sum-of-unique-elements
1833-maximum-ice-cream-bars
1855-maximum-distance-between-a-pair-of-values
1967-number-of-strings-that-appear-as-substrings-in-word
2078-two-furthest-houses-with-different-colors
2161-partition-array-according-to-given-pivot
2540-minimum-common-value
2553-separate-the-digits-in-an-array

Two Pointers

0061-rotate-list
0653-two-sum-iv-input-is-a-bst
0845-longest-mountain-in-array
1346-check-if-n-and-its-double-exist
1855-maximum-distance-between-a-pair-of-values
2000-reverse-prefix-of-word
2095-delete-the-middle-node-of-a-linked-list
2161-partition-array-according-to-given-pivot
2540-minimum-common-value

Binary Search

0153-find-minimum-in-rotated-sorted-array
0367-valid-perfect-square
1346-check-if-n-and-its-double-exist
1855-maximum-distance-between-a-pair-of-values
2540-minimum-common-value

Math

0007-reverse-integer
0048-rotate-image
0367-valid-perfect-square
0445-add-two-numbers-ii
1486-xor-operation-in-an-array
3783-mirror-distance-of-an-integer

Greedy

0409-longest-palindrome
0678-valid-parenthesis-string
1833-maximum-ice-cream-bars
2078-two-furthest-houses-with-different-colors

Stack

0445-add-two-numbers-ii
0678-valid-parenthesis-string
0897-increasing-order-search-tree
1475-final-prices-with-a-special-discount-in-a-shop
2000-reverse-prefix-of-word
2390-removing-stars-from-a-string

Tree

0102-binary-tree-level-order-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0111-minimum-depth-of-binary-tree
0112-path-sum
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0257-binary-tree-paths
0404-sum-of-left-leaves
0450-delete-node-in-a-bst
0513-find-bottom-left-tree-value
0653-two-sum-iv-input-is-a-bst
0701-insert-into-a-binary-search-tree
0897-increasing-order-search-tree
1373-maximum-sum-bst-in-binary-tree

Depth-First Search

0111-minimum-depth-of-binary-tree
0112-path-sum
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0257-binary-tree-paths
0404-sum-of-left-leaves
0513-find-bottom-left-tree-value
0547-number-of-provinces
0653-two-sum-iv-input-is-a-bst
0733-flood-fill
0897-increasing-order-search-tree
1373-maximum-sum-bst-in-binary-tree

Binary Search Tree

0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0450-delete-node-in-a-bst
0653-two-sum-iv-input-is-a-bst
0701-insert-into-a-binary-search-tree
0897-increasing-order-search-tree
1373-maximum-sum-bst-in-binary-tree

Binary Tree

0102-binary-tree-level-order-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0111-minimum-depth-of-binary-tree
0112-path-sum
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0257-binary-tree-paths
0404-sum-of-left-leaves
0450-delete-node-in-a-bst
0513-find-bottom-left-tree-value
0653-two-sum-iv-input-is-a-bst
0701-insert-into-a-binary-search-tree
0897-increasing-order-search-tree
1373-maximum-sum-bst-in-binary-tree

Linked List

0061-rotate-list
0445-add-two-numbers-ii
0705-design-hashset
2095-delete-the-middle-node-of-a-linked-list

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0409-longest-palindrome
0653-two-sum-iv-input-is-a-bst
0705-design-hashset
1189-maximum-number-of-balloons
1346-check-if-n-and-its-double-exist
1358-number-of-substrings-containing-all-three-characters
1394-find-lucky-integer-in-an-array
1748-sum-of-unique-elements
2540-minimum-common-value

Design

0705-design-hashset

Hash Function

0705-design-hashset

String

0003-longest-substring-without-repeating-characters
0257-binary-tree-paths
0409-longest-palindrome
0678-valid-parenthesis-string
0796-rotate-string
1189-maximum-number-of-balloons
1358-number-of-substrings-containing-all-three-characters
1967-number-of-strings-that-appear-as-substrings-in-word
2000-reverse-prefix-of-word
2390-removing-stars-from-a-string
3612-process-string-with-special-operations-i

Backtracking

0257-binary-tree-paths

Breadth-First Search

0102-binary-tree-level-order-traversal
0111-minimum-depth-of-binary-tree
0112-path-sum
0404-sum-of-left-leaves
0513-find-bottom-left-tree-value
0542-01-matrix
0547-number-of-provinces
0653-two-sum-iv-input-is-a-bst
0733-flood-fill
0994-rotting-oranges

Counting

1189-maximum-number-of-balloons
1394-find-lucky-integer-in-an-array
1748-sum-of-unique-elements

Divide and Conquer

0106-construct-binary-tree-from-inorder-and-postorder-traversal
0190-reverse-bits

Bit Manipulation

0190-reverse-bits
0476-number-complement
1486-xor-operation-in-an-array

Simulation

0867-transpose-matrix
2161-partition-array-according-to-given-pivot
2390-removing-stars-from-a-string
2553-separate-the-digits-in-an-array
3612-process-string-with-special-operations-i

String Matching

0796-rotate-string

Matrix

0048-rotate-image
0542-01-matrix
0733-flood-fill
0867-transpose-matrix
0994-rotting-oranges

Sliding Window

0003-longest-substring-without-repeating-characters
1358-number-of-substrings-containing-all-three-characters

Prefix Sum

1732-find-the-highest-altitude

Sorting

1346-check-if-n-and-its-double-exist
1833-maximum-ice-cream-bars

Counting Sort

1833-maximum-ice-cream-bars

Monotonic Stack

1475-final-prices-with-a-special-discount-in-a-shop

Dynamic Programming

0542-01-matrix
0678-valid-parenthesis-string
0845-longest-mountain-in-array
1373-maximum-sum-bst-in-binary-tree

Union-Find

0547-number-of-provinces

Graph Theory

0547-number-of-provinces

Enumeration

0845-longest-mountain-in-array