LeetCodes

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Stack

Problem Name	Difficulty
0094-binary-tree-inorder-traversal	Easy
0144-binary-tree-preorder-traversal	Easy
0145-binary-tree-postorder-traversal	Easy
0590-n-ary-tree-postorder-traversal	Easy

Tree

Problem Name	Difficulty
0094-binary-tree-inorder-traversal	Easy
0144-binary-tree-preorder-traversal	Easy
0145-binary-tree-postorder-traversal	Easy
0590-n-ary-tree-postorder-traversal	Easy

Depth-First Search

Problem Name	Difficulty
0094-binary-tree-inorder-traversal	Easy
0144-binary-tree-preorder-traversal	Easy
0145-binary-tree-postorder-traversal	Easy
0590-n-ary-tree-postorder-traversal	Easy

Binary Tree

Problem Name	Difficulty
0094-binary-tree-inorder-traversal	Easy
0144-binary-tree-preorder-traversal	Easy
0145-binary-tree-postorder-traversal	Easy

Database

Problem Name	Difficulty
0175-combine-two-tables	Easy
0176-second-highest-salary	Medium

Array

Problem Name	Difficulty
0167-two-sum-ii-input-array-is-sorted	Medium
1980-find-unique-binary-string	Medium

Hash Table

Problem Name	Difficulty
1980-find-unique-binary-string	Medium

String

Problem Name	Difficulty
1980-find-unique-binary-string	Medium

Backtracking

Problem Name	Difficulty
1980-find-unique-binary-string	Medium

Two Pointers

Problem Name	Difficulty
0167-two-sum-ii-input-array-is-sorted	Medium

Binary Search

Problem Name	Difficulty
0167-two-sum-ii-input-array-is-sorted	Medium

Name		Name	Last commit message	Last commit date
Latest commit History 320 Commits
0001-two-sum		0001-two-sum
0002-add-two-numbers		0002-add-two-numbers
0003-longest-substring-without-repeating-characters		0003-longest-substring-without-repeating-characters
0011-container-with-most-water		0011-container-with-most-water
0021-merge-two-sorted-lists		0021-merge-two-sorted-lists
0050-powx-n		0050-powx-n
0053-maximum-subarray		0053-maximum-subarray
0066-plus-one		0066-plus-one
0083-remove-duplicates-from-sorted-list		0083-remove-duplicates-from-sorted-list
0094-binary-tree-inorder-traversal		0094-binary-tree-inorder-traversal
0113-path-sum-ii		0113-path-sum-ii
0118-pascals-triangle		0118-pascals-triangle
0119-pascals-triangle-ii		0119-pascals-triangle-ii
0121-best-time-to-buy-and-sell-stock		0121-best-time-to-buy-and-sell-stock
0144-binary-tree-preorder-traversal		0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal		0145-binary-tree-postorder-traversal
0153-find-minimum-in-rotated-sorted-array		0153-find-minimum-in-rotated-sorted-array
0167-two-sum-ii-input-array-is-sorted		0167-two-sum-ii-input-array-is-sorted
0175-combine-two-tables		0175-combine-two-tables
0176-second-highest-salary		0176-second-highest-salary
0189-rotate-array		0189-rotate-array
0205-isomorphic-strings		0205-isomorphic-strings
0206-reverse-linked-list		0206-reverse-linked-list
0209-minimum-size-subarray-sum		0209-minimum-size-subarray-sum
0217-contains-duplicate		0217-contains-duplicate
0219-contains-duplicate-ii		0219-contains-duplicate-ii
0228-summary-ranges		0228-summary-ranges
0231-power-of-two		0231-power-of-two
0238-product-of-array-except-self		0238-product-of-array-except-self
0283-move-zeroes		0283-move-zeroes
0290-word-pattern		0290-word-pattern
0326-power-of-three		0326-power-of-three
0342-power-of-four		0342-power-of-four
0344-reverse-string		0344-reverse-string
0345-reverse-vowels-of-a-string		0345-reverse-vowels-of-a-string
0349-intersection-of-two-arrays		0349-intersection-of-two-arrays
0350-intersection-of-two-arrays-ii		0350-intersection-of-two-arrays-ii
0383-ransom-note		0383-ransom-note
0387-first-unique-character-in-a-string		0387-first-unique-character-in-a-string
0389-find-the-difference		0389-find-the-difference
0405-convert-a-number-to-hexadecimal		0405-convert-a-number-to-hexadecimal
0414-third-maximum-number		0414-third-maximum-number
0415-add-strings		0415-add-strings
0442-find-all-duplicates-in-an-array		0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array		0448-find-all-numbers-disappeared-in-an-array
0459-repeated-substring-pattern		0459-repeated-substring-pattern
0463-island-perimeter		0463-island-perimeter
0509-fibonacci-number		0509-fibonacci-number
0523-continuous-subarray-sum		0523-continuous-subarray-sum
0541-reverse-string-ii		0541-reverse-string-ii
0557-reverse-words-in-a-string-iii		0557-reverse-words-in-a-string-iii
0560-subarray-sum-equals-k		0560-subarray-sum-equals-k
0572-subtree-of-another-tree		0572-subtree-of-another-tree
0590-n-ary-tree-postorder-traversal		0590-n-ary-tree-postorder-traversal
0643-maximum-average-subarray-i		0643-maximum-average-subarray-i
0709-to-lower-case		0709-to-lower-case
0724-find-pivot-index		0724-find-pivot-index
0744-find-smallest-letter-greater-than-target		0744-find-smallest-letter-greater-than-target
0771-jewels-and-stones		0771-jewels-and-stones
0812-largest-triangle-area		0812-largest-triangle-area
0876-middle-of-the-linked-list		0876-middle-of-the-linked-list
0877-stone-game		0877-stone-game
0961-n-repeated-element-in-size-2n-array		0961-n-repeated-element-in-size-2n-array
0976-largest-perimeter-triangle		0976-largest-perimeter-triangle
0977-squares-of-a-sorted-array		0977-squares-of-a-sorted-array
1021-remove-outermost-parentheses		1021-remove-outermost-parentheses
1200-minimum-absolute-difference		1200-minimum-absolute-difference
1221-split-a-string-in-balanced-strings		1221-split-a-string-in-balanced-strings
1281-subtract-the-product-and-sum-of-digits-of-an-integer		1281-subtract-the-product-and-sum-of-digits-of-an-integer
1295-find-numbers-with-even-number-of-digits		1295-find-numbers-with-even-number-of-digits
1323-maximum-69-number		1323-maximum-69-number
1342-number-of-steps-to-reduce-a-number-to-zero		1342-number-of-steps-to-reduce-a-number-to-zero
1351-count-negative-numbers-in-a-sorted-matrix		1351-count-negative-numbers-in-a-sorted-matrix
1356-sort-integers-by-the-number-of-1-bits		1356-sort-integers-by-the-number-of-1-bits
1365-how-many-numbers-are-smaller-than-the-current-number		1365-how-many-numbers-are-smaller-than-the-current-number
1389-create-target-array-in-the-given-order		1389-create-target-array-in-the-given-order
1431-kids-with-the-greatest-number-of-candies		1431-kids-with-the-greatest-number-of-candies
1470-shuffle-the-array		1470-shuffle-the-array
1480-running-sum-of-1d-array		1480-running-sum-of-1d-array
1486-xor-operation-in-an-array		1486-xor-operation-in-an-array
1512-number-of-good-pairs		1512-number-of-good-pairs
1518-water-bottles		1518-water-bottles
1523-count-odd-numbers-in-an-interval-range		1523-count-odd-numbers-in-an-interval-range
1526-minimum-number-of-increments-on-subarrays-to-form-a-target-array		1526-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1534-count-good-triplets		1534-count-good-triplets
1539-kth-missing-positive-number		1539-kth-missing-positive-number
1550-three-consecutive-odds		1550-three-consecutive-odds
1572-matrix-diagonal-sum		1572-matrix-diagonal-sum
1603-design-parking-system		1603-design-parking-system
1637-widest-vertical-area-between-two-points-containing-no-points		1637-widest-vertical-area-between-two-points-containing-no-points
1668-maximum-repeating-substring		1668-maximum-repeating-substring
1672-richest-customer-wealth		1672-richest-customer-wealth
1684-count-the-number-of-consistent-strings		1684-count-the-number-of-consistent-strings
1720-decode-xored-array		1720-decode-xored-array
1732-find-the-highest-altitude		1732-find-the-highest-altitude
1769-minimum-number-of-operations-to-move-all-balls-to-each-box		1769-minimum-number-of-operations-to-move-all-balls-to-each-box
1832-check-if-the-sentence-is-pangram		1832-check-if-the-sentence-is-pangram
1863-sum-of-all-subset-xor-totals		1863-sum-of-all-subset-xor-totals
1913-maximum-product-difference-between-two-pairs		1913-maximum-product-difference-between-two-pairs
1920-build-array-from-permutation		1920-build-array-from-permutation

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