├── .all-contributorsrc ├── .github └── ISSUE_TEMPLATE │ └── feature_request.md ├── .gitignore ├── Algorithms ├── Bit-Manipulation │ ├── README.md │ ├── flipping-bits.java │ ├── lonely-integer.php │ └── xor-subsequence.cpp ├── Constructive-Algorithms │ ├── README.md │ ├── flipping-the-matrix.cpp │ └── new-year-chaos.cpp ├── Dynamic-Programming │ ├── README.md │ ├── coin-change.cpp │ ├── construct_the_array.cpp │ ├── dynamic-programming-classics-the-longest-common-subsequence.cpp │ ├── equal.cpp │ ├── fibonacci-modified.py │ ├── maxsubarray.cpp │ └── stockmax.cpp ├── Graph-Theory │ ├── Kruskal-(MST):-Really-Special-Subtree.java │ ├── README.md │ ├── even-tree.cpp │ ├── even-tree.java │ ├── journey-to-the-moon.cpp │ ├── missile-defend.cpp │ ├── the-quickest-way-up.cpp │ └── torque-and-development.cpp ├── Greedy │ ├── README.md │ ├── angry-children.cpp │ ├── board-cutting.cpp │ ├── candies.cpp │ ├── chief-hopper.cpp │ ├── goodland_electricity.py │ ├── greedy-florist.cpp │ ├── grid-challenge.cpp │ ├── jim-and-the-orders.cpp │ ├── largest-permutation.cpp │ ├── luck-balance.cpp │ ├── marcs-cakewalk.cpp │ ├── mark-and-toys.cpp │ ├── maximum-perimeter-triangle.cpp │ ├── minimum-absolute-difference-in-an-array.cpp │ ├── priyanka-and-toys.cpp │ ├── sherlock-and-the-beast.c │ └── two-arrays.cpp ├── Implementation │ ├── README.md │ ├── Sequence-Equation.java │ ├── absolute-permutation.cpp │ ├── acm-icpc-team.cpp │ ├── angry-professor.java │ ├── apple-and-orange.cpp │ ├── beautiful-days-at-the-movies.cpp │ ├── beautiful-triplets.php │ ├── between-two-sets.cpp │ ├── bigger-is-greater.php │ ├── bon-appetit.php │ ├── breaking-best-and-worst-records.php │ ├── cats-and-a-mouse.py │ ├── cavity-map.php │ ├── chocolate-feast.php │ ├── circular-array-rotation.c │ ├── climbing-the-leaderboard.cpp │ ├── counting-valleys.py │ ├── cut-the-sticks.php │ ├── day-of-the-programmer.py │ ├── designer-pdf-viewer.cpp │ ├── divisible-sum-pairs.c │ ├── drawing-book.py │ ├── electronics-shop.py │ ├── encryption.java │ ├── equality-in-a-array.php │ ├── equalize-the-array.java │ ├── extra-long-factorials.cpp │ ├── extra-long-factorials.java │ ├── find-digits.py │ ├── flatland-space-stations.cpp │ ├── grading.cpp │ ├── jumping-on-the-clouds-revisited.php │ ├── jumping-on-the-clouds.php │ ├── kangaroo.py │ ├── library-fine.php │ ├── library-fine.py │ ├── lisa-workbook.cpp │ ├── magic-square-forming.py │ ├── manasa-and-stones.php │ ├── migratory-birds.py │ ├── minimum-distances.cpp │ ├── non-divisible-subset.php │ ├── picking-numbers.py │ ├── queens-attack-2.cpp │ ├── repeated-string.php │ ├── sales-by-march.c │ ├── save-the-prisoner.c │ ├── service-lane.py │ ├── sherlock-and-squares.java │ ├── sock-merchant.cpp │ ├── strange-advertising.py │ ├── strange-code.php │ ├── taum-and-bday.cpp │ ├── the-birthday-bar.py │ ├── the-grid-search.cpp │ ├── the-hurdle-race.py │ └── utopian-tree.java ├── Sorting │ ├── Intro-to-Tutorial-Challenges.java │ ├── README.md │ ├── big-sorting.cpp │ ├── closest-numbers.php │ ├── correctness-invariant.cpp │ ├── countingsort1.cpp │ ├── countingsort2.cpp │ ├── countingsort4.php │ ├── find-the-median.cpp │ ├── insertionsort1.cpp │ ├── insertionsort2.cpp │ ├── lilys-homework.py │ ├── quicksort1.cpp │ └── runningtime.cpp ├── Strings │ ├── README.md │ ├── beautiful-binary-string.cpp │ ├── caesar-cipher-1.cpp │ ├── camelcase.cpp │ ├── funny-string.java │ ├── gem-stones.php │ ├── mars-exploration.cpp │ ├── pangrams.java │ ├── reduced-string.cpp │ ├── sherlock-and-valid-string.cpp │ ├── similar-strings.cpp │ ├── the-love-letter-mystery.cpp │ ├── two-strings.cpp │ └── weighted-uniform-string.php └── Warmup │ ├── README.md │ ├── a-very-big-sum.cpp │ ├── a-very-big-sum.java │ ├── birthday-cake-candles.cpp │ ├── birthday-cake-candles.py │ ├── compare-the-triplets.cpp │ ├── diagonal-difference.cpp │ ├── diagonal-difference.java │ ├── mini-max-sum.cpp │ ├── plus-minus.java │ ├── simple-array-sum.cpp │ ├── simple-array-sum.java │ ├── solve-me-first.cpp │ ├── solve-me-first.php │ ├── staircase.cpp │ ├── staircase.java │ ├── time-conversion.cpp │ └── time-conversion.php ├── Artificial-Intelligence ├── Bot-Building │ ├── Bot-saves-princess---2.java │ ├── Bot-saves-princess.java │ ├── README.md │ ├── botclean.c │ ├── botcleanlarge.py │ ├── botcleanr.c │ ├── botcleanv2.c │ ├── click-o-mania.py │ └── maze-escape.cpp ├── Games │ ├── README.md │ ├── lightsout.cpp │ └── the-bidding-game.py ├── Natural-Language-Processing │ ├── README.md │ ├── from-paragraphs-to-sentences.php │ ├── nlp-compute-the-cross-entropy.py │ ├── nlp-compute-the-perplexity.py │ ├── nlp-similarity-scores.py │ └── the-trigram.php ├── Probability-&-Statistics---Foundations │ ├── README.md │ ├── basic-probability-puzzles-1.text │ ├── basic-probability-puzzles-10.text │ ├── basic-probability-puzzles-2.text │ ├── basic-probability-puzzles-3.text │ ├── basic-probability-puzzles-4.text │ ├── basic-probability-puzzles-5.text │ ├── basic-probability-puzzles-6.text │ ├── basic-probability-puzzles-7.text │ ├── basic-probability-puzzles-8.text │ └── the-central-limit-theorem-1.text └── Statistics-and-Machine-Learning │ ├── README.md │ ├── battery.py │ ├── correlation-and-regression-lines-6.py │ ├── correlation-and-regression-lines-7.text │ ├── correlation-and-regression-lines-8.text │ ├── markov-snakes-and-ladders.py │ ├── predicting-house-prices.py │ ├── predicting-office-space-price.py │ └── stockprediction.py ├── C++ ├── Classes │ ├── README.md │ ├── box-it.cpp │ └── virtual-functions.cpp ├── Introduction │ ├── README.md │ ├── arrays-introduction.cpp │ ├── c-tutorial-basic-data-types.cpp │ ├── c-tutorial-conditional-if-else.cpp │ ├── c-tutorial-for-loop.cpp │ ├── c-tutorial-functions.cpp │ ├── c-tutorial-pointer.cpp │ ├── cpp-hello-world.cpp │ ├── cpp-input-and-output.cpp │ └── variable-sized-arrays.cpp ├── Other-Concepts │ ├── README.md │ └── preprocessor-solution.cpp ├── STL │ ├── README.md │ ├── deque-stl.cpp │ ├── vector-erase.cpp │ └── vector-sort.cpp └── Strings │ ├── README.md │ ├── Strings.cpp │ └── attribute-parser.cpp ├── Contributing.md ├── Data-Structures ├── Arrays │ ├── 2D-Array.java │ ├── 2d-array.cpp │ ├── Arrays.java │ ├── README.md │ ├── array-left-rotation.cpp │ ├── crush.cpp │ ├── dynamic-array.cpp │ ├── dynamic-array.java │ ├── sparse-arrays.cpp │ └── sparse-arrays.java ├── Heap │ ├── README.md │ └── qheap1.cpp ├── Linked-Lists │ ├── Cycle-Detection.java │ ├── Delete-a-Node.java │ ├── Find-Merge-Point-of-Two-Lists.java │ ├── Get-Node-Value.java │ ├── Inserting-a-Node-Into-a-Sorted-Doubly-Linked-List.java │ ├── Print-in-Reverse.java │ ├── README.md │ ├── compare-two-linked-lists.java │ ├── delete-duplicate-value-nodes-from-a-sorted-linked-list.java │ ├── insert-a-node-at-a-specific-position-in-a-linked-list.java │ ├── insert-a-node-at-the-head-of-a-linked-list.cpp │ ├── insert-a-node-at-the-tail-of-a-linked-list.cpp │ ├── merge-two-sorted-linked-lists.java │ ├── print-the-elements-of-a-linked-list.c │ ├── print-the-elements-of-a-linked-list.cpp │ ├── reverse-a-doubly-linked-list.cpp │ ├── reverse-a-linked-list.c │ ├── reverse-a-linked-list.cpp │ └── reverse-a-linked-list.java ├── Stacks │ ├── README.md │ ├── balanced-brackets.c │ ├── equal-stacks.java │ ├── game-of-two-stacks.cpp │ └── maximum-element.c └── Trees │ ├── README.md │ ├── Tree:-Inorder-Traversal.java │ ├── Tree:-Postorder-Traversal.java │ ├── Tree:-Preorder-Traversal.java │ ├── binary-search-tree-insertion.cpp │ ├── binary-search-tree-lowest-common-ancestor.cpp │ ├── is-binary-search-tree.java │ ├── tree-height-of-a-binary-tree.cpp │ ├── tree-huffman-decoding.cpp │ ├── tree-level-order-traversal.cpp │ └── tree-top-view.cpp ├── Databases └── Relational-Algebra │ ├── README.md │ ├── basics-of-sets-and-relational-algebra-1.text │ ├── basics-of-sets-and-relational-algebra-2.text │ ├── basics-of-sets-and-relational-algebra-3.text │ ├── basics-of-sets-and-relational-algebra-4.text │ ├── basics-of-sets-and-relational-algebra-5.text │ ├── basics-of-sets-and-relational-algebra-6.text │ └── basics-of-sets-and-relational-algebra-7.text ├── Functional-Programming └── Introduction │ ├── README.md │ ├── area-under-curves-and-volume-of-revolving-a-curv.hs │ ├── eval-ex.hs │ ├── fp-array-of-n-elements.hs │ ├── fp-filter-array.hs │ ├── fp-filter-positions-in-a-list.hs │ ├── fp-hello-world-n-times.hs │ ├── fp-hello-world.scala │ ├── fp-list-length.hs │ ├── fp-list-replication.hs │ ├── fp-reverse-a-list.hs │ ├── fp-solve-me-first.hs │ ├── fp-sum-of-odd-elements.hs │ ├── fp-update-list.hs │ ├── lambda-calculus-evaluate-the-expression.text │ ├── lambda-calculus-reductions-1.text │ ├── lambda-calculus-reductions-2.text │ └── lambda-calculus-reductions-3.text ├── Java ├── Introduction │ ├── Java-Loops-II.java │ ├── Java-Stdin-and-Stdout-II.java │ ├── README.md │ └── Welcome-to-Java!.java └── Strings │ ├── Java-Substring-Comparisons.java │ ├── README.md │ └── java-regex.java ├── LICENSE ├── Mathematics ├── Algebra │ ├── README.md │ └── triangle-numbers.py ├── Combinatorics │ ├── README.md │ └── ncr-table.cpp ├── Fundamentals │ ├── README.md │ ├── best-divisor.cpp │ ├── connecting-towns.cpp │ ├── diwali-lights.py │ ├── even-odd-query.cpp │ ├── filling-jars.py │ ├── find-point.cpp │ ├── game-with-cells.py │ ├── halloween-party.cpp │ ├── handshake.cpp │ ├── harry-potter-and-the-floating-rocks.py │ ├── is-fibo.py │ ├── k-candy-store.cpp │ ├── leonardo-and-prime.cpp │ ├── lowest-triangle.py │ ├── matrix-tracing.cpp │ ├── maximum-draws.cpp │ ├── most-distant.py │ ├── p1-paper-cutting.py │ ├── restaurant.py │ ├── reverse-game.cpp │ ├── sherlock-and-divisors.cpp │ ├── sherlock-and-moving-tiles.py │ ├── sherlock-and-permutations.cpp │ ├── special-multiple.php │ ├── strange-grid.cpp │ └── summing-the-n-series.cpp └── Number-Theory │ ├── README.md │ ├── closest-number.cpp │ └── the-chosen-one.cpp ├── Others ├── README.md ├── count-triplets-1.py ├── countingsort3.c ├── make-it-anagram-mglines.py ├── minimum-swaps-2.cpp └── python-raw-input.py ├── Python ├── Basic-Data-Types │ ├── README.md │ ├── find-second-maximum-number-in-a-list.py │ ├── finding-the-percentage.py │ ├── list-comprehensions.py │ ├── nested-list.py │ ├── python-lists.py │ └── python-tuples.py ├── Collections │ ├── README.md │ └── collections-counter.py ├── Introduction │ ├── README.md │ ├── py-hello-world.py │ ├── py-if-else.py │ ├── python-arithmetic-operators.py │ ├── python-division.py │ ├── python-loops.py │ ├── python-print.py │ └── write-a-function.py ├── Math │ ├── README.md │ └── polar-coordinates.py ├── Numpy │ ├── README.md │ ├── np-arrays.py │ ├── np-concatenate.py │ ├── np-shape-reshape.py │ └── np-transpose-and-flatten.py ├── Regex-and-Parsing │ ├── README.md │ └── re-split.py ├── Sets │ ├── README.md │ ├── no-idea.py │ ├── py-check-strict-superset.py │ ├── py-check-subset.py │ ├── py-introduction-to-sets.py │ ├── py-set-add.py │ ├── py-set-difference-operation.py │ ├── py-set-discard-remove-pop.py │ ├── py-set-intersection-operation.py │ ├── py-set-mutations.py │ ├── py-set-symmetric-difference-operation.py │ ├── py-set-union.py │ ├── py-the-captains-room.py │ └── symmetric-difference.py └── Strings │ ├── README.md │ ├── alphabet-rangoli.py │ ├── capitalize.py │ ├── designer-door-mat.py │ ├── find-a-string.py │ ├── merge-the-tools.py │ ├── python-mutations.py │ ├── python-string-formatting.py │ ├── python-string-split-and-join.py │ ├── string-validators.py │ ├── swap-case.py │ ├── text-alignment.py │ ├── text-wrap.py │ ├── the-minion-game.py │ └── whats-your-name.py ├── README.md ├── SQL ├── Advanced-Select │ ├── README.md │ ├── occupations.sql │ ├── the-company.sql │ └── the-pads.sql └── Basic-Select │ ├── README.md │ ├── japanese-cities-attributes.sql │ ├── japanese-cities-name.sql │ ├── more-than-75-marks.sql │ ├── name-of-employees.sql │ ├── revising-the-select-query-2.sql │ ├── revising-the-select-query.sql │ ├── select-all-sql.sql │ ├── select-by-id.sql │ ├── weather-observation-station-1.sql │ ├── weather-observation-station-10.sql │ ├── weather-observation-station-3.sql │ ├── weather-observation-station-4.sql │ ├── weather-observation-station-6.sql │ ├── weather-observation-station-7.sql │ ├── weather-observation-station-8.sql │ └── weather-observation-station-9.sql ├── Security ├── Concepts │ ├── README.md │ ├── Security-Encryption-Scheme.java │ └── Security-Key-Spaces.java └── Functions │ ├── README.md │ ├── security-bijective-functions.c │ ├── security-function-ii.c │ └── security-tutorial-functions.c ├── Tutorials ├── 10-Days-of-Javascript │ ├── README.md │ ├── js10-arithmetic-operators.js │ ├── js10-arrays.js │ ├── js10-data-types.js │ ├── js10-function.js │ ├── js10-hello-world.js │ ├── js10-if-else.js │ ├── js10-let-and-const.js │ ├── js10-loops.js │ ├── js10-switch.js │ └── js10-try-catch-and-finally.js ├── 10-Days-of-Statistics │ ├── README.md │ └── s10-basic-statistics.php ├── 30-Days-of-Code │ ├── 30-2d-arrays.py │ ├── 30-arrays.py │ ├── 30-binary-numbers.py │ ├── 30-class-vs-instance.py │ ├── 30-dictionaries-and-maps.py │ ├── 30-exceptions-string-to-integer.py │ ├── 30-hello-world.py │ ├── 30-inheritance.py │ ├── 30-linked-list.cpp │ ├── 30-loops.py │ ├── 30-more-exceptions.py │ ├── 30-recursion.py │ ├── 30-review-loop.py │ ├── 30-scope.py │ ├── Day-13:-Abstract-Classes.java │ ├── Day-1:-Data-Types.java │ ├── Day-2:-Operators.java │ ├── Day-3:-Intro-to-Conditional-Statements.java │ └── README.md ├── Cracking-the-Coding-Interview │ ├── README.md │ ├── ctci-array-left-rotation.cpp │ ├── ctci-bubble-sort.cpp │ ├── ctci-is-binary-search-tree.py │ └── ctci-ransom-note.cpp └── LinkedIn-Placements │ ├── README.md │ ├── linkedin-practice-array-left-rotation.cpp │ ├── linkedin-practice-bigger-is-greater.cpp │ ├── linkedin-practice-binary-numbers.cpp │ ├── linkedin-practice-bitwise-and.cpp │ ├── linkedin-practice-caesar-cipher.cpp │ ├── linkedin-practice-dictionaries-and-maps.php │ ├── 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