1604. Alert Using Same Key-Card Three or More Times in a One Hour Period

LeetCode company workers use key-cards to unlock office doors. Each time a worker uses their key-card, the security system saves the worker's name and the time when it was used. The system emits an alert if any worker uses the key-card three or more times in a one-hour period.

You are given a list of strings keyName and keyTime where [keyName[i], keyTime[i]] corresponds to a person's name and the time when their key-card was used in a single day.

Access times are given in the 24-hour time format "HH:MM", such as "23:51" and "09:49".

Return a list of unique worker names who received an alert for frequent keycard use. Sort the names in ascending order alphabetically.

Notice that "10:00" - "11:00" is considered to be within a one-hour period, while "22:51" - "23:52" is not considered to be within a one-hour period.

Example 1:

Input: keyName = ["daniel","daniel","daniel","luis","luis","luis","luis"], keyTime = ["10:00","10:40","11:00","09:00","11:00","13:00","15:00"]
Output: ["daniel"]
Explanation: "daniel" used the keycard 3 times in a one-hour period ("10:00","10:40", "11:00").

Example 2:

Input: keyName = ["alice","alice","alice","bob","bob","bob","bob"], keyTime = ["12:01","12:00","18:00","21:00","21:20","21:30","23:00"]
Output: ["bob"]
Explanation: "bob" used the keycard 3 times in a one-hour period ("21:00","21:20", "21:30").

Example 3:

Input: keyName = ["john","john","john"], keyTime = ["23:58","23:59","00:01"]
Output: []

Example 4:

Input: keyName = ["leslie","leslie","leslie","clare","clare","clare","clare"], keyTime = ["13:00","13:20","14:00","18:00","18:51","19:30","19:49"]
Output: ["clare","leslie"]

Constraints:

• 1 <= keyName.length, keyTime.length <= 105
• keyName.length == keyTime.length
• keyTime[i] is in the format " HH:MM".
• [keyName[i], keyTime[i]] is unique.
• 1 <= keyName[i].length <= 10
• keyName[i] contains only lowercase English letters.

# @lc code=start
using LeetCode
using Dates

function alert_names(key_name::Vector{String}, key_time::Vector{String})
    res = Vector{String}()
    mp = Dict{String,Vector{Time}}()
    for (idx, name) in enumerate(key_name)
        if !haskey(mp, name)
            mp[name] = String[]
        end
        push!(mp[name], Time(key_time[idx]))
    end
    for (name, time) in mp
        sort!(time)
        for idx in 1:(length(time) - 2)
            time1h = time[idx] + Hour(1)
            if time[idx + 1] <= time1h && time[idx + 2] <= time1h
                push!(res, name)
                break
            end
        end
    end
    return sort!(res)
end

# add your code here:
# @lc code=end

alert_names (generic function with 1 method)

This page was generated using DemoCards.jl and Literate.jl.