#Hackerrank
## Team Formation Hackerrank | Julia

## Solution in Julia:

## Logic applied to solve this problem

HackerRank is organising a chess tournament for its employees. There are n employees, having IDs 1, 2, n, where the employee has a rating of rating. Two employees can form a team if they have the same rating, and one employee can be in at most one team.

There are q queries, each of the form ( r). For each query, find the number of teams that can be formed from employees with IDs between / and r, inclusive. All queries are Independent of each other.

Example:

Consider n = 4 rating = [2, 3, 4, 2], q=2

queries = [[1,4],[3,4]]

For the first query, all employees are considered Employees with D's 1 and 4 can be teamed as their ratings are the seme There are no other team formations possible so the number of teams is For the second query, employees 3 and 4 are considered either ratings are [34] Since they are different ng teams can be formed. 50. The number of teams is 0.

The function is expected to return an INTEGER ARRAY.

# The function accepts following parameters:

# 1. INTEGER ARRAY rating

# 2. 2D INTEGER ARRAY queries

# Solution in Julia

function countTeams(rating, queries)

n = length(rating)

results = []

for query in queries

l, r = query[1], query[2]

seen = Dict{Int,Bool}()

teams = 0

for i in l:r

if haskey(seen, rating[i]) && !seen[rating[i]]

teams += 1

seen[rating[i]] = true

elseif !haskey(seen, rating[i])

seen[rating[i]] = false

end

end

push!(results, teams)

end

return results

end

println(countTeams([2, 3, 4, 2], [[1,4],[3,4]]))

The logic to solve the chess tournament problem is as follows:

For each query, iterate over the range of employees specified in the query.

For each employee, check if their rating has been seen before.

If the rating has not been seen before, add it to the seen dictionary with a value of false.

If the rating has been seen before and has not been added to a team yet (seen[rating[i]] == false), increment the teams count and mark the rating as added to a team in the seen dictionary by setting seen[rating[i]] = true.

Return the total number of teams that can be formed for each query.

The idea is to use a dictionary to keep track of which ratings have been seen before and whether or not they have been added to a team. By checking this dictionary for each employee, we can determine whether or not they can be added to an existing team or whether they need to form a new team.

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