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Add expert assessments for C#, Go, and Python
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‎LANGUAGE_PARITY_MATRIX.md‎

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This matrix tracks module and checkpoint parity across C++, C#, Go, and Python.
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- Canonical order is defined by the C++ track.
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- Current priority is to extend checkpoint parity beyond `02-core` now that module parity reaches `04-expert` across all active tracks.
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- Module and checkpoint parity now reach `04-expert` across all active tracks.
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- Status labels:
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- `Done`: module implemented with example, exercises, and README.
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- `Planned`: module not implemented yet, already queued in order.
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| 4 | inheritance-and-polymorphism | Done | Done | Done | Done |
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| 5 | templates-basics | Done | Done | Done | Done |
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`04-expert` is now implemented across C#, Go, and Python; the next parity target is projects and assessments beyond `02-core`.
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`04-expert` projects and assessments are now implemented across C#, Go, and Python.
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### Expert (`04-expert`)
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| 01-foundations | Done | Done | Done | Done |
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| 02-core | Done | Done | Done | Done |
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| 03-advanced | Done | Done | Done | Done |
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| 04-expert | Done | Planned | Planned | Planned |
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| 04-expert | Done | Done | Done | Done |

‎README.md‎

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| Language | Current Levels | Coverage | Track Status |
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| --- | --- | --- | --- |
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| C++ | 00-setup, 01-foundations, 02-core, 03-advanced, 04-expert | Foundations, Core, Advanced, Expert, projects, assessments | Most complete and primary track |
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| C# | 01-foundations, 02-core, 03-advanced, 04-expert | 8/8 foundations modules, 6/6 core modules, 5/5 advanced modules, 5/5 expert modules, 4/4 projects, 3/4 assessments | Module parity complete through expert, final assessments pending |
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| Go | 01-foundations, 02-core, 03-advanced, 04-expert | 8/8 foundations modules, 6/6 core modules, 5/5 advanced modules, 5/5 expert modules, 4/4 projects, 3/4 assessments | Module parity complete through expert, final assessments pending |
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| Python | 01-foundations, 02-core, 03-advanced, 04-expert | 8/8 foundations modules, 6/6 core modules, 5/5 advanced modules, 5/5 expert modules, 4/4 projects, 3/4 assessments | Module parity complete through expert, final assessments pending |
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| C# | 01-foundations, 02-core, 03-advanced, 04-expert | 8/8 foundations modules, 6/6 core modules, 5/5 advanced modules, 5/5 expert modules, 4/4 projects, 4/4 assessments | Module and checkpoint parity complete through expert |
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| Go | 01-foundations, 02-core, 03-advanced, 04-expert | 8/8 foundations modules, 6/6 core modules, 5/5 advanced modules, 5/5 expert modules, 4/4 projects, 4/4 assessments | Module and checkpoint parity complete through expert |
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| Python | 01-foundations, 02-core, 03-advanced, 04-expert | 8/8 foundations modules, 6/6 core modules, 5/5 advanced modules, 5/5 expert modules, 4/4 projects, 4/4 assessments | Module and checkpoint parity complete through expert |
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Parity planning reference: [LANGUAGE_PARITY_MATRIX.md](LANGUAGE_PARITY_MATRIX.md)
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‎languages/csharp/CHECKLIST.md‎

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- [ ] Complete `assessments/01-foundations`.
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- [ ] Complete `assessments/02-core`.
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- [ ] Complete `assessments/03-advanced`.
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- [ ] Complete `assessments/04-expert`.
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## Parity Goals
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‎languages/csharp/README.md‎

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- 5/5 advanced modules implemented (`structs-and-classes`, `constructors-and-invariants`, `copy-and-move-semantics`, `inheritance-and-polymorphism`, `templates-basics`).
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- 5/5 expert modules implemented (`memory-management-and-raii`, `smart-pointers-in-depth`, `concurrency-basics`, `performance-and-profiling-basics`, `modularization-and-build-structure`).
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- 4/4 projects implemented (`01-foundations`, `02-core`, `03-advanced`, `04-expert`).
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- 3/4 assessments implemented (`01-foundations`, `02-core`, `03-advanced`).
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- 4/4 assessments implemented (`01-foundations`, `02-core`, `03-advanced`, `04-expert`).
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- Same module naming as C++, Python, and Go for parity.
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## Prerequisites
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- [01-foundations](./assessments/01-foundations/README.md)
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- [02-core](./assessments/02-core/README.md)
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- [03-advanced](./assessments/03-advanced/README.md)
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- [04-expert](./assessments/04-expert/README.md)
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## Progress Tracking
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‎languages/csharp/assessments/04-expert/README.md‎

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# Assessment 04: Expert
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## Goal
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Practice shared-data coordination, concurrent work distribution, and thread-safe aggregation.
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## Task
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Write a program that:
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1. Keeps the assessment data in one owned container.
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2. Splits work across multiple tasks.
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3. Uses `lock` to protect shared aggregation state.
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4. Computes:
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- total sum
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- minimum value
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- maximum value
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5. Prints per-worker partial sums and final summary.
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## Quick Run
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```bash
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dotnet run --project assessment-04-expert.csproj
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```
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## Expected Output (shape)
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```text
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Worker 0 partial sum: ...
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Worker 1 partial sum: ...
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...
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Final summary:
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Total: ...
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Minimum: ...
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Maximum: ...
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```
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## What To Check
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- Shared updates happen only inside the `lock`.
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- Each worker computes its own partial result before merging it.
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- All tasks finish before the final summary is printed.

‎languages/csharp/assessments/04-expert/assessment-04-expert.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>disable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>

‎languages/csharp/assessments/04-expert/main.cs‎

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using System;
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using System.Collections.Generic;
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using System.Threading.Tasks;
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sealed class DataSet
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{
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public DataSet(List<int> values)
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{
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Values = values;
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}
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public List<int> Values { get; }
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}
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sealed class Summary
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{
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public long Total { get; set; }
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public int Minimum { get; set; } = int.MaxValue;
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public int Maximum { get; set; } = int.MinValue;
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}
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class Program
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{
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static void Main()
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{
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DataSet data = new DataSet(new List<int> { 12, 7, 25, 4, 31, 19, 2, 45, 18, 9, 27, 6 });
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int workerCount = 3;
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int chunkSize = (data.Values.Count + workerCount - 1) / workerCount;
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Summary globalSummary = new Summary();
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object gate = new object();
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Task[] tasks = new Task[workerCount];
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for (int workerId = 0; workerId < workerCount; workerId++)
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{
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int capturedWorkerId = workerId;
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int begin = capturedWorkerId * chunkSize;
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int end = Math.Min(begin + chunkSize, data.Values.Count);
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tasks[capturedWorkerId] = Task.Run(() =>
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{
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if (begin >= end)
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{
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return;
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}
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long localTotal = 0;
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int localMin = data.Values[begin];
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int localMax = data.Values[begin];
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for (int index = begin; index < end; index++)
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{
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int value = data.Values[index];
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localTotal += value;
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if (value < localMin)
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{
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localMin = value;
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}
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if (value > localMax)
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{
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localMax = value;
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}
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}
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lock (gate)
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{
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Console.WriteLine($"Worker {capturedWorkerId} partial sum: {localTotal}");
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globalSummary.Total += localTotal;
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if (localMin < globalSummary.Minimum)
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{
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globalSummary.Minimum = localMin;
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}
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if (localMax > globalSummary.Maximum)
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{
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globalSummary.Maximum = localMax;
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}
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}
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});
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}
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Task.WaitAll(tasks);
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Console.WriteLine();
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Console.WriteLine("Final summary:");
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Console.WriteLine($"Total: {globalSummary.Total}");
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Console.WriteLine($"Minimum: {globalSummary.Minimum}");
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Console.WriteLine($"Maximum: {globalSummary.Maximum}");
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}
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}

‎languages/csharp/assessments/README.md‎

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1. [01-foundations](./01-foundations/README.md)
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2. [02-core](./02-core/README.md)
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3. [03-advanced](./03-advanced/README.md)
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4. [04-expert](./04-expert/README.md)
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## Next Gap
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`04-expert` assessment does not exist yet in this track.
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All assessment checkpoints through `04-expert` are available in this track.

‎languages/go/CHECKLIST.md‎

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- [ ] Complete `assessments/01-foundations`.
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- [ ] Complete `assessments/02-core`.
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- [ ] Complete `assessments/03-advanced`.
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- [ ] Complete `assessments/04-expert`.
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## Parity Goals
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‎languages/go/README.md‎

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- 5/5 advanced modules implemented (`structs-and-classes`, `constructors-and-invariants`, `copy-and-move-semantics`, `inheritance-and-polymorphism`, `templates-basics`).
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- 5/5 expert modules implemented (`memory-management-and-raii`, `smart-pointers-in-depth`, `concurrency-basics`, `performance-and-profiling-basics`, `modularization-and-build-structure`).
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- 4/4 projects implemented (`01-foundations`, `02-core`, `03-advanced`, `04-expert`).
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- 3/4 assessments implemented (`01-foundations`, `02-core`, `03-advanced`).
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- 4/4 assessments implemented (`01-foundations`, `02-core`, `03-advanced`, `04-expert`).
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- Same module naming as C++, Python, and C# for parity.
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## Prerequisites
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- [01-foundations](./assessments/01-foundations/README.md)
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- [02-core](./assessments/02-core/README.md)
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- [03-advanced](./assessments/03-advanced/README.md)
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- [04-expert](./assessments/04-expert/README.md)
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## Progress Tracking
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