# 24110lt343/summer_assignment_2501920109001 architecture

> Architecture diagram of the GitHub repository 24110lt343/summer_assignment_2501920109001, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-08-12). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/24110lt343/summer_assignment_2501920109001
- Repository: https://github.com/24110lt343/summer_assignment_2501920109001

## Overview

#### Purpose and Scope
This is a Java learning repository organized as a three-week, day-by-day set of standalone data-structure, algorithm, and language-feature exercises. It has no indicated unified application, build system, service layer, or deployment target.

#### Execution Model and Entry Points
Each `.java` file is an independently compilable exercise or demonstration, generally expected to be run directly when it contains a `main` method. There is no repository-wide launcher. Likely demonstration entry points include:
- `Week_1/LibraryInterfaceDemo.java`
- `Week_2/package_live/Test.java`
- `Week_3/TestCompartment.java`

#### Week 1: Arrays, Matrices, and Basic Strings
The first stage concentrates on array traversal, two-pointer/sliding-window methods, matrix iteration, and basic string operations. Problems are intentionally isolated rather than sharing a domain model.
- `Week_1/Day_1/TwoSum.java`
- `Week_1/Day_3/ContainerWithMostWater.java`
- `Week_1/Day_4/SpiralMatrix.java`

#### Week 2: String Algorithms and Java Package Demonstration
Week 2 advances into hash-based string operations, substring/permutation processing, recursion or stack-style decoding, and grouped transformations.
- `Week_2/Day_2/PermutationOfStrings.java`
- `Week_2/Day_4/DecodeString.java`
- `Week_2/Day_5/GroupAnagrams.java`

A separate package-oriented example models a small interface/implementation boundary: `Playable` is the contract and instrument classes supply implementations, consumed by a test driver.
- `Week_2/package_music/Playable.java`
- `Week_2/package_music/string/Veena.java`
- `Week_2/package_live/Test.java`

#### Week 3: Linked Structures, Stacks, and Queues
The final stage focuses on mutable linked-list operations and linear data structures. Individual classes encapsulate algorithmic state such as linked nodes, stack contents, or queue behavior; they do not form a shared reusable library.
- `Week_3/Day_1/ReverseLL.java`
- `Week_3/Day_3/MinStack.java`
- `Week_3/Day_5/QueueUsingStack.java`

#### Primary Data and Control Flow
Typical control flow is local: construct primitive arrays, strings, or linear data structures; execute an algorithm; return or print a result. Progression is pedagogical rather than runtime-driven: Week 1 covers contiguous data, Week 2 text and recursion-oriented tasks, and Week 3 pointer-based and stack/queue structures. Cross-file integration is limited to the package/interface examples.

#### Runtime and External Boundaries
The material runtime is the Java/JVM standard library. No external services, databases, APIs, frontend, cloud infrastructure, or dependency-management/build artifacts are present in the supplied tree. Package paths under `Week_2/package_music` are the principal explicit module boundary; all algorithm files otherwise appear self-contained.

Main entry points: [`Week_2/package_live/Test.java`](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/package_live/Test.java) (Package test driver), [`Week_1/Day_3/ContainerWithMostWater.java`](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_1/Day_3/ContainerWithMostWater.java) (Container With Most Water), [`Week_1/Day_4/SpiralMatrix.java`](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_1/Day_4/SpiralMatrix.java) (Spiral Matrix), [`Week_2/Day_2/PermutationOfStrings.java`](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/Day_2/PermutationOfStrings.java) (String permutations)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_week1["Week 1"]
  node_library_demo["Library interface demo<br/>standalone demo"]
  node_two_sum["Two Sum<br/>array exercise<br/>[TwoSum.java]"]
  node_container_water["Container With Most Water<br/>two-pointer exercise"]
  node_spiral_matrix["Spiral Matrix<br/>matrix exercise<br/>[SpiralMatrix.java]"]
end

subgraph group_week2["Week 2"]
  node_permutations["String permutations<br/>string exercise"]
  node_decode_string["Decode String<br/>recursion/stack exercise<br/>[DecodeString.java]"]
  node_group_anagrams["Group Anagrams<br/>hashing exercise<br/>[GroupAnagrams.java]"]
  node_playable["Playable<br/>Java interface<br/>[Playable.java]"]
  node_veena["Veena<br/>instrument implementation<br/>[Veena.java]"]
  node_music_test["Package test driver<br/>standalone driver<br/>[Test.java]"]
end

subgraph group_week3["Week 3"]
  node_reverse_ll["Reverse linked list<br/>linked-list exercise<br/>[ReverseLL.java]"]
  node_min_stack["Min Stack<br/>stack exercise<br/>[MinStack.java]"]
  node_queue_using_stack["Queue Using Stack<br/>queue exercise"]
  node_compartment_test["Compartment test<br/>standalone demo"]
end

node_jvm{{"Java/JVM<br/>runtime"}}

node_library_demo -->|"runs on"| node_jvm
node_music_test -->|"uses contract"| node_playable
node_music_test -->|"instantiates"| node_veena
node_veena -->|"implements"| node_playable
node_music_test -->|"runs on"| node_jvm
node_compartment_test -->|"runs on"| node_jvm
node_two_sum -.->|"array progression"| node_container_water
node_container_water -.->|"matrix progression"| node_spiral_matrix
node_spiral_matrix -.->|"week progression"| node_permutations
node_permutations -.->|"string progression"| node_decode_string
node_decode_string -.->|"string progression"| node_group_anagrams
node_group_anagrams -.->|"week progression"| node_reverse_ll
node_reverse_ll -.->|"linear structures"| node_min_stack
node_min_stack -.->|"stack-to-queue progression"| node_queue_using_stack

click node_library_demo "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_1/LibraryInterfaceDemo.java"
click node_two_sum "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_1/Day_1/TwoSum.java"
click node_container_water "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_1/Day_3/ContainerWithMostWater.java"
click node_spiral_matrix "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_1/Day_4/SpiralMatrix.java"
click node_permutations "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/Day_2/PermutationOfStrings.java"
click node_decode_string "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/Day_4/DecodeString.java"
click node_group_anagrams "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/Day_5/GroupAnagrams.java"
click node_playable "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/package_music/Playable.java"
click node_veena "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/package_music/string/Veena.java"
click node_music_test "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/package_live/Test.java"
click node_reverse_ll "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_3/Day_1/ReverseLL.java"
click node_min_stack "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_3/Day_3/MinStack.java"
click node_queue_using_stack "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_3/Day_5/QueueUsingStack.java"
click node_compartment_test "https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_3/TestCompartment.java"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_library_demo,node_two_sum,node_container_water,node_spiral_matrix toneBlue
class node_permutations,node_decode_string,node_group_anagrams,node_playable,node_veena,node_music_test toneAmber
class node_reverse_ll,node_min_stack,node_queue_using_stack,node_compartment_test toneMint
class node_jvm toneNeutral
```

## Components

### Week 1

Arrays, matrices, and basic strings.

- [Library interface demo](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_1/LibraryInterfaceDemo.java): standalone demo · `Week_1/LibraryInterfaceDemo.java`
- [Two Sum](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_1/Day_1/TwoSum.java): array exercise · `Week_1/Day_1/TwoSum.java`
- [Container With Most Water](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_1/Day_3/ContainerWithMostWater.java): two-pointer exercise · `Week_1/Day_3/ContainerWithMostWater.java`
- [Spiral Matrix](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_1/Day_4/SpiralMatrix.java): matrix exercise · `Week_1/Day_4/SpiralMatrix.java`

### Week 2

String algorithms and package examples.

- [String permutations](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/Day_2/PermutationOfStrings.java): string exercise · `Week_2/Day_2/PermutationOfStrings.java`
- [Decode String](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/Day_4/DecodeString.java): recursion/stack exercise · `Week_2/Day_4/DecodeString.java`
- [Group Anagrams](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/Day_5/GroupAnagrams.java): hashing exercise · `Week_2/Day_5/GroupAnagrams.java`
- [Playable](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/package_music/Playable.java): Java interface · Instrument contract. · `Week_2/package_music/Playable.java`
- [Veena](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/package_music/string/Veena.java): instrument implementation · `Week_2/package_music/string/Veena.java`
- [Package test driver](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_2/package_live/Test.java): standalone driver · `Week_2/package_live/Test.java`

### Week 3

Linked structures, stacks, and queues.

- [Reverse linked list](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_3/Day_1/ReverseLL.java): linked-list exercise · `Week_3/Day_1/ReverseLL.java`
- [Min Stack](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_3/Day_3/MinStack.java): stack exercise · `Week_3/Day_3/MinStack.java`
- [Queue Using Stack](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_3/Day_5/QueueUsingStack.java): queue exercise · `Week_3/Day_5/QueueUsingStack.java`
- [Compartment test](https://github.com/24110lt343/summer_assignment_2501920109001/blob/main/Week_3/TestCompartment.java): standalone demo · `Week_3/TestCompartment.java`

### Other components

- **Java/JVM**: runtime · Standard-library runtime for standalone exercises.

## Connections

- Library interface demo → Java/JVM: runs on
- Package test driver → Playable: uses contract
- Package test driver → Veena: instantiates
- Veena → Playable: implements
- Package test driver → Java/JVM: runs on
- Compartment test → Java/JVM: runs on
- Two Sum → Container With Most Water: array progression
- Container With Most Water → Spiral Matrix: matrix progression
- Spiral Matrix → String permutations: week progression
- String permutations → Decode String: string progression
- Decode String → Group Anagrams: string progression
- Group Anagrams → Reverse linked list: week progression
- Reverse linked list → Min Stack: linear structures
- Min Stack → Queue Using Stack: stack-to-queue progression