All lessons & trainings solved in Swift 4.2
Correctness: 100%🔥
Performance: 100%🔥
Lesson 1 - Iterations (https://app.codility.com/programmers/lessons/1-iterations/)
- BinaryGap: Find longest sequence of zeros in binary representation of an integer.
Lesson 2 - Arrays (https://app.codility.com/programmers/lessons/2-arrays/)
- OddOccurrencesInArray: Find value that occurs in odd number of elements.
- CyclicRotation: Rotate an array to the right by a given number of steps.
Lesson 3 - Time Complexity (https://app.codility.com/programmers/lessons/3-time_complexity/)
- FrogJmp: Count minimal number of jumps from position X to Y.
- PermMissingElem: Find the missing element in a given permutation.
- TapeEquilibrium: Minimize the value |(A[0] + ... + A[P-1]) - (A[P] + ... + A[N-1])|.
Lesson 4 - Counting Elements (https://app.codility.com/programmers/lessons/4-counting_elements/)
- PermCheck: Check whether array A is a permutation.
- FrogRiverOne: Find the earliest time when a frog can jump to the other side of a river.
- MissingInteger: Find the minimal positive integer not occurring in a given sequence.
- MaxCounters: Calculate the values of counters after applying all alternating operations: increase counter by 1; set value of all counters to current maximum.
Lesson 5 - Prefix Sums (https://app.codility.com/programmers/lessons/5-prefix_sums/)
- PassingCars: Count the number of passing cars on the road.
- GenomicRangeQuery: Find the minimal nucleotide from a range of sequence DNA.
- MinAvgTwoSlice: Find the minimal average of any slice containing at least two elements.
- CountDiv: Compute number of integers divisible by k in range [a..b].
Lesson 6 - Sorting (https://app.codility.com/programmers/lessons/6-sorting/)
- Distinct: Compute number of distinct values in an array.
- MaxProductOfThree: Maximize A[P] * A[Q] * A[R] for any triplet (P, Q, R).
- Triangle: Determine whether a triangle can be built from a given set of edges.
- NumberOfDiscIntersections: Compute the number of intersections in a sequence of discs.
Lesson 7 - Stacks and Queues (https://app.codility.com/programmers/lessons/7-stacks_and_queues/)
- Brackets: Determine whether a given string of parentheses is properly nested.
- Fish: N voracious fish are moving along a river. Calculate how many fish are alive.
- Nesting: Determine whether given string of parentheses is properly nested.
- StoneWall: Cover "Manhattan skyline" using the minimum number of rectangles.
Lesson 8 - Leader (https://app.codility.com/programmers/lessons/8-leader/)
- EquiLeader: Find the index S such that the leaders of the sequences A[0], A[1], ..., A[S] and A[S + 1], A[S + 2], ..., A[N - 1] are the same.
- Dominator: Find an index of an array such that its value occurs at more than half of indices in the array.
Lesson 9 - Maximum slice problem (https://app.codility.com/programmers/lessons/9-maximum_slice_problem/)
- MaxSliceSum: Find a maximum sum of a compact subsequence of array elements.
- MaxProfit: Given a log of stock prices compute the maximum possible earning.
- MaxDoubleSliceSum: Find the maximal sum of any double slice.
Lesson 10 - Prime and composite numbers (https://app.codility.com/programmers/lessons/10-prime_and_composite_numbers/)
- CountFactors: Count factors of given number n.
- MinPerimeterRectangle: Find the minimal perimeter of any rectangle whose area equals N.
- Peaks: Divide an array into the maximum number of same-sized blocks, each of which should contain an index P such that A[P - 1] < A[P] > A[P + 1].
- Flags: Find the maximum number of flags that can be set on mountain peaks.
Lesson 11 - Sieve of Eratosthenes (https://app.codility.com/programmers/lessons/11-sieve_of_eratosthenes/)
- CountSemiprimes: Count the semiprime numbers in the given range [a..b].
- CountNonDivisible: Calculate the number of elements of an array that are not divisors of each element.
Lesson 12 - Euclidean algorithm (https://app.codility.com/programmers/lessons/12-euclidean_algorithm/)
- ChocolatesByNumbers: There are N chocolates in a circle. Count the number of chocolates you will eat.
- CommonPrimeDivisors: Check whether two numbers have the same prime divisors.
Lesson 13 - Fibonacci numbers (https://app.codility.com/programmers/lessons/13-fibonacci_numbers/)
- Ladder: Count the number of different ways of climbing to the top of a ladder.
- FibFrog: Count the minimum number of jumps required for a frog to get to the other side of a river.
Lesson 14 - Binary search algorithm (https://app.codility.com/programmers/lessons/14-binary_search_algorithm/)
- MinMaxDivision: Divide array A into K blocks and minimize the largest sum of any block.
- NailingPlanks: Count the minimum number of nails that allow a series of planks to be nailed.
Lesson 15 - Caterpillar method (https://app.codility.com/programmers/lessons/15-caterpillar_method/)
- CountDistinctSlices: Count the number of distinct slices (containing only unique numbers).
- CountTriangles: Count the number of triangles that can be built from a given set of edges.
- AbsDistinct: Compute number of distinct absolute values of sorted array elements.
- MinAbsSumOfTwo: Find the minimal absolute value of a sum of two elements.
Lesson 16 - Greedy algorithms (https://app.codility.com/programmers/lessons/16-greedy_algorithms/)
- MaxNonoverlappingSegments: Find a maximal set of non-overlapping segments.
- TieRopes: Tie adjacent ropes to achieve the maximum number of ropes of length >= K.
Lesson 17 - Dynamic programming (https://app.codility.com/programmers/lessons/17-dynamic_programming/)
- NumberSolitaire: In a given array, find the subset of maximal sum in which the distance between consecutive elements is at most 6.
- MinAbsSum: Given array of integers, find the lowest absolute sum of elements.
Training 1 - Tasks from Indeed Prime 2015 challenge (https://app.codility.com/programmers/trainings/1/)
- LongestPassword: Given a string containing words, find the longest word that satisfies specific conditions.
- FloodDepth: Find the maximum depth of water in mountains after a huge rainfall.
SlalomSkiing: Given a sequence, find the longest subsequence that can be decomposed into at most three monotonic parts.
Training 2 - Tasks from Indeed Prime 2016 challenge (https://app.codility.com/programmers/trainings/2/)
- RectangleBuilderGreaterArea: Count the distinct rectangle sizes, of area greater than or equal to X, that can be built out of a given set of segments.
TreeProduct: Remove at most two edges from a tree graph to maximize the product of the components' sizes.HilbertMaze: Find the shortest path between two fields in a Hilbert maze.- DwarfsRafting: Find out how many dwarfs can fit on a raft such that it's balanced when crossing a river.
Training 3 - Tasks from Indeed Prime 2016 College Coders challenge (https://app.codility.com/programmers/trainings/3/)
- TennisTournament: Given the numbers of players and available courts, calculate the maximum number of parallel tennis games.
- SocksLaundering: From drawers containing both clean and dirty socks, choose socks to launder in order to obtain the maximum number of clean pairs of socks.
ArrayRecovery: Recover a broken array using partial information in another array.- DiamondsCount: Given points on a plane, count the number of sets of four points that form regular diamonds.
Training 4 - Algorithmic skills (https://app.codility.com/programmers/trainings/4/)
- ArrayInversionCount: Compute number of inversion in an array.
- DisappearingPairs: Reduce a string containing instances of the letters "A", "B" and "C" via the following rule: remove one occurrence of "AA", "BB" or "CC".
- FirstUnique: Find the first unique number in a given sequence.
- StrSymmetryPoint: Find a symmetry point of a string, if any.
- PolygonConcavityIndex: Check whether a given polygon in a 2D plane is convex; if not, return the index of a vertex that doesn't belong to the convex hull.
- TreeHeight: Compute the height of a binary tree.
Training 5 - Coding skills (https://app.codility.com/programmers/trainings/5/)
- ParityDegree: Find the highest power of 2 that divides N.
- ParkingBill: Given two strings representing times of entry and exit from a car parking lot, find the cost of the ticket according to the given billing rules.
ThreeLetters: Given two integers A and B, return a string which contains A letters "a" and B letters "b" with no three consecutive letters being the same.
Training 6 - SQL (https://app.codility.com/programmers/trainings/6/)
SqlEventsDelta: Compute the difference between the latest and the second latest value for each event type.- SqlSum: Calculate sum of elements.
SqlWorldCup: Given a list of matches in a group stage of the soccer World Cup, compute the number of points each team currently has.