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AVAILABLE LESSONS:
Lesson 1
Iterations
Lesson 2
Arrays
Lesson 3
Time Complexity
Lesson 4
Counting Elements
Lesson 5
Prefix Sums
Lesson 6
Sorting
Lesson 7
Stacks and Queues
Lesson 8
Leader
Lesson 9
Maximum slice problem
Lesson 10
Prime and composite numbers
Lesson 11
Sieve of Eratosthenes
Lesson 12
Euclidean algorithm
Lesson 13
Fibonacci numbers
Lesson 14
Binary search algorithm
Lesson 15
Caterpillar method
Lesson 16
Greedy algorithms
Lesson 17
Dynamic programming
Lesson 99
Future training
Lesson 99

Future training

Tasks:

easy

StrSymmetryPoint

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Find a symmetry point of a string, if any.
easy

TreeHeight

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Compute the height of a binary tree.
medium

ArrayInversionCount

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Compute number of inversion in an array.
hard

PolygonConcavityIndex

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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.