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codeforces
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elements-of-programming-interviews
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- 1-two-sum
- 10-regular-expression-matching
- 102-binary-tree-level-order-traversal
- 103-binary-tree-zigzag-level-order-traversal
- 104-maximum-depth-of-a-binary-tree
- 1091-shortest-path-in-binary-matrix
- 1094-car-pooling
- 11-container-with-most-water
- 1109-corporate-flight-bookings
- 111-minimum-depth-of-binary-tree
- 115-distinct-subsequences
- 1166-design-file-system
- 120-triangle
- 121-best-time-to-buy-and-sell-stock
- 122-best-time-to-buy-and-sell-stock-ii
- 1236-web-crawler
- 1239-max-len-of-a-concat-str-with-unique-chars
- 1242-web-crawler-multithreaded
- 1249-minimum-remove-to-make-valid-parens
- 125-valid-palindrome
- 127-word-ladder
- 128-longest-consecutive-sequence
- 1293-shortest-path-in-grid-with-obstacle-elimination
- 13-roman-to-integer
- 130-surrounded-regions
- 1306-jump-game-iii
- 133-clone-graph
- 134-gas-station
- 136-single-number
- 138-copy-list-with-random-pointer
- 139-word-break
- 140-work-break-ii
- 141-linked-list-cycle
- 1428-leftmost-column-with-at-least-a-one
- 145-binary-tree-postorder-traversal
- 146-lru-cache
- 148-sort-list
- 15-3-sum
- 151-reverse-all-words-in-a-string
- 1539-kth-missing-positive-number
- 154-find-minimum-in-rotated-sorted-array-ii
- 155-min-stack
- 1570-dot-product-of-sparse-vectors
- 1589-maximum-sum-obtained-of-any-permutation
- 160-intersection-of-two-linked-lists
- 1610-maximum-number-of-visible-points
- 162-find-peak-element
- 163-missing-ranges
- 1650-lowest-common-ancestory-in-binary-tree-iii
- 167-two-sum-ii
- 169-majority-element
- 17-letter-combinations-of-a-phone-number
- 1700-number-of-students-unable-to-eat-lunch
- 173-binary-search-tree-iterator
- 1762-buildings-with-an-ocean-view
- 189-rotate-array
- 1891-cutting-ribbons
- 19-remove-nth-node-from-end-of-list
- 190-reverse-bits
- 198-house-robber
- 199-binary-tree-right-side-view
- 2-add-two-numbers
- 20-valid-parentheses
- 200-number-of-islands
- 206-reverse-linked-list
- 207-course-schedule
- 209-minimum-size-subarray-sum
- 21-merge-two-sorted-lists
- 210-course-schedule-ii
- 211-design-add-and-search-words-data-structure
- 215-kth-largest-element-in-array
- 22-generate-parentheses
- 224-basic-calculator
- 227-basic-calculator-ii
- 23-merge-k-sorted-lists
- 236-lowest-common-ancestor-of-a-binary-tree
- 237-delete-node-in-linked-list
- 238-product-of-array-except-self
- 24-swap-nodes-in-pairs
- 240-search-a-2d-matrix-ii
- 241-number-of-ways-to-add-parentheses
- 249-group-shifted-strings
- 253-meeting-rooms-ii
- 256-paint-house
- 261-graph-valid-tree
- 269-alien-dictionary
- 270-closest-bst-value
- 272-closest-binary-tree-search-val-2
- 273-integer-to-english-words
- 279-perfect-squares
- 283-move-zeroes
- 3-longest-substring-without-repeating-characters
- 300-longest-increasing-subsequence
- 305-number-of-islands-ii
- 307-range-sum-query-mutable
- 31-next-permutation
- 314-binary-tree-vertical-order-traversal
- 322-coin-change
- 329-longest-increasing-path-in-matrix
- 33-search-in-rotated-sorted-array
- 338-counting-bits
- 339-nested-list-weight-sum
- 341-flatten-list-iterator
- 344-reverse-string
- 346-moving-average-in-data-stream
- 347-top-k-frequent-elements
- 36-validate-sudoku
- 37-sudoku-solver
- 378-kth-smallest-element-in-a-sorted-matrix
- 398-random-pick-index
- 4-median-of-two-sorted-arrays
- 408-valid-abbreviation
- 412-fizz-buzz
- 413-arithmetic-slices
- 416-partition-equal-subset-ranges
- 419-battleships-in-board
- 42-trapping-rain-water
- 42-trapping-rainwater
- 421-maximum-xor-of-two-numbers-in-array
- 426-convert-bst-to-sorted-dll
- 438-find-all-anagrams-in-string
- 46-permutations
- 49-group-anagrams
- 496-next-greater-element-i
- 498-diagonal-traversal
- 5-longest-palindromic-substring
- 50-pow-x-n
- 518-coin-change-2
- 518-coin-change
- 523-continuous-subarray-sum
- 528-random-pick-with-weight
- 53-maximum-subarray
- 535-encode-and-decode-tinyurl
- 54-spiral-matrix
- 543-diameter-of-binary-tree
- 56-merge-intervals
- 560-subarray-sum-equals-k
- 581-smallest-window-to-sort
- 583-delete-operation-for-two-strings
- 6-zig-zag-conversion
- 617-merge-two-binary-trees
- 621-task-scheduler
- 635-design-log-storage-system
- 647-palindromic-substrings
- 65-valid-number
- 651-4-keys-keyboard
- 652-find-duplicate-subtrees
- 658-find-k-closest-elements
- 665-non-decreasing-array
- 670-maximum-swap
- 680-valid-palindrome-ii
- 681-next-closest-time
- 687-longest-univalue-path
- 695-max-area-of-island
- 698-partition-to-k-equal-sum-subsets
- 7-reverse-integer
- 701-insert-into-binary-search-tree
- 704-binary-search
- 707-design-linked-list
- 708-insert-into-sorted-circular-linked-list
- 71-simplify-path
- 712-minimum-ascii-delete
- 713-subarray-product-less-than-k
- 72-edit-distance
- 726-number-of-atoms
- 73-set-matrix-zeroes
- 739-daily-temperatures
- 74-search-a-2d-matrix
- 743-network-time-delay
- 75-sort-colors
- 750-corner-rectangles
- 76-minimum-window-substring
- 766-toeplitz-matrix
- 776-split-bst
- 78-subsets
- 789-escape-ghosts
- 79-word-search
- 790-domino-tromino-tiling
- 791-custom-sort-string
- 8-string-to-integer-atoi
- 814-binary-tree-pruning
- 824-goat-latin
- 827-making-a-large-island
- 844-backspace-string-compare
- 845-longest-mountain-in-array
- 846-hands-of-straights
- 852-peak-index-in-a-mountain-array
- 853-car-fleet
- 861-score-after-flipping-matrix
- 867-transpose-matrix
- 877-stone-game
- 88-merge-sorted-array
- 888-fair-candy-swap
- 89-gray-code
- 890-find-and-replace-pattern
- 894-all-possible-full-binary-trees
- 896-monotonic-array
- 897-increasing-order-search-tree
- 898-bitwise-ors-of-subarrays
- 899-orderly-queue
- 904-fruit-into-baskets
- 91-decode-numstring
- 917-reverse-only-letters
- 918-maximum-sum-circular-subarray
- 921-minimum-add-to-make-parens-valid
  - 921-minimum-add-to-make-parens-valid.py
  - solution.py
- 93-restore-ip-addresses
- 930-binary-subarrays-with-sum
- 931-minimum-falling-sum
- 933-number-of-recent-calls
- 938-range-sum-of-bst
- 94-binary-tree-inorder-traversal
- 945-minimum-increment-to-make-array-unique
- 946-validate-stack-sequences
- 967-number-with-same-consecutive-differences
- 97-interleaving-string
- 973-k-closest-points-to-origin
- 98-validate-binary-search-tree
- 980-unique-paths-iii
- 987-vertical-order-traversal-of-binary-tree
- 994-rotting-oranges
- unsolved
- .DS_Store
- 1644-lowest-common-ancestor-of-binary-tree-ii.py
- 235-lowest-common-ancestor-of-binary-search-tree.py
- 236-lowest-common-ancestor-of-binary-tree.py
- 250-count-univalue-subtrees.py
- 284-peeking-iterator.py
- 415-add-strings.py
- 772-basic-calculator-iii.py
- README.md
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README.md
requirements.txt
unix-philosophy.md

921-minimum-add-to-make-parens-valid

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921-minimum-add-to-make-parens-valid.py		921-minimum-add-to-make-parens-valid.py
solution.py		solution.py

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