decrypt.ps1

# Decrypt input data and problem information

$7ZipExecutablePath = 'C:\Program Files\7-Zip\7z.exe'
$ZipPassword = $Env:AoCZipPassword
$parallelProcesses = [System.Collections.Generic.List[System.Diagnostics.Process]]::new()

if ($false -eq (Test-Path $7ZipExecutablePath)) { Write-Error "7zip not found." }
if ([string]::IsNullOrEmpty($ZipPassword)) { Write-Error "Zip password not defined" }

$filesToUnzip = Get-ChildItem -Include ('input.zip', 'problem.zip') -r
foreach ($fileToUnzip in $filesToUnzip) {

    $7ZipArgs = @(
        "e",
        "-o`"$($fileToUnzip.DirectoryName)`""
        "`"$($fileToUnzip.FullName)`"",
        "-aoa"
        "-p$($ZipPassword)"
    )

    $p = Start-Process $7ZipExecutablePath -ArgumentList $7ZipArgs -PassThru -WindowStyle 'Hidden'

    $parallelProcesses.Add($p)
}

$parallelProcesses | Wait-Process -Timeout 300

# TODO check exit code of each process for errors