# vedesh-reddy/daily-leetcode architecture

> Architecture diagram of the GitHub repository vedesh-reddy/daily-leetcode, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-08-14). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/vedesh-reddy/daily-leetcode
- Repository: https://github.com/vedesh-reddy/daily-leetcode

## Overview

#### Purpose and Entry Points
This is a Java solution archive for daily LeetCode problems, not an integrated application or library. Each source file is an independent problem entry point intended for the LeetCode judge, with its own `Solution` implementation and any problem-required data structures.

The effective entry points are individual files under `solutions/`, for example:
- `solutions/01.find-the-grid-of-region-average-medium.java`
- `solutions/26.design-an-atm-machine-medium.java`
- `solutions/61.adjacent-increasing-subarrays-detection-i-easy.java`

#### Repository Organization Boundary
The repository has one architectural boundary: standalone submissions versus shared infrastructure. There is no visible build system, package hierarchy, shared Java module, test suite, service runtime, or application bootstrap. `README.md` only identifies the collection as `daily-leetcode`.

Because LeetCode commonly requires a class named `Solution`, these files should be compiled and evaluated independently rather than together; combining them in one Java compilation unit would likely create class-name conflicts.

#### Algorithm-Solution Units
Each numbered file represents one isolated algorithmic unit: input is supplied by the online judge, a method executes the solution, and the result is returned to the judge. Examples span core problem domains:
- Array, arithmetic, and greedy processing: `solutions/02.number-of-sub-arrays-with-odd-sum-medium.java`, `solutions/16.maximum-number-of-weeks-for-which-you-can-work-medium.java`, `solutions/42.minimize-array-sum-using-divisible-replacements-medium.java`
- String and parsing transformations: `solutions/20.check-if-a-string-can-break-another-string-medium.java`, `solutions/52.split-two-strings-to-make-palindrome-medium.java`
- Search and state-space traversal: `solutions/12.sliding-puzzle-hard.java`, `solutions/53.shortest-path-to-get-all-keys-hard.java`

#### Data-Structure-Centric Solutions
Several submissions implement or operate on judge-provided structural types, creating a boundary with LeetCode’s model classes such as linked-list, tree, iterator, or multilevel-node definitions:
- Trees: `solutions/06.binary-search-tree-to-greater-sum-tree-medium.java`, `solutions/30.average-of-levels-in-binary-tree-easy.java`
- Linked structures: `solutions/14.linked-list-cycle-easy.java`, `solutions/54.flatten-a-multilevel-doubly-linked-list-medium.java`
- Stateful design objects: `solutions/26.design-an-atm-machine-medium.java`, `solutions/34.min-stack-medium.java`, `solutions/28.peeking-iterator-medium.java`

#### Graph, Grid, and Dynamic-Programming Stages
The more complex units encode standard algorithm stages internally: construct/traverse a graph or grid, maintain search state, and return an optimal/reachable result. Representative implementations include:
- Graph reachability/path computation: `solutions/11.shortest-path-with-alternating-colors-medium.java`, `solutions/44.reachable-nodes-in-subdivided-graph-hard.java`
- Grid search: `solutions/07.swim-in-rising-water-hard.java`, `solutions/27.word-search-medium.java`
- Dynamic programming or combinatorial optimization: `solutions/15.maximum-and-sum-of-array-hard.java`, `solutions/29.super-egg-drop-hard.java`, `solutions/51.count-of-integers-hard.java`

#### Runtime and External Dependencies
The material runtime is Java under the LeetCode execution environment. Inputs, invocation, assertion, and model-type provisioning are external responsibilities of that judge. No databases, network APIs, cloud infrastructure, deployment artifacts, or third-party services are represented in the repository tree.

Main entry points: [`solutions/06.binary-search-tree-to-greater-sum-tree-medium.java`](https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/06.binary-search-tree-to-greater-sum-tree-medium.java) (Tree model units), [`solutions/14.linked-list-cycle-easy.java`](https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/14.linked-list-cycle-easy.java) (Linked-structure units), [`solutions/26.design-an-atm-machine-medium.java`](https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/26.design-an-atm-machine-medium.java) (Stateful design units), [`README.md`](https://github.com/vedesh-reddy/daily-leetcode/blob/main/README.md) (Collection README)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_archive["Daily solution archive"]
  node_readme["Collection README<br/>repository metadata<br/>[README.md]"]
  node_submissions["Independent submissions<br/>Java solution files"]
  node_array_solutions["Array and greedy units<br/>algorithm submissions"]
  node_string_solutions["String transformation units<br/>algorithm submissions"]
  node_search_solutions["State-space search units<br/>algorithm submissions"]
  node_graph_solutions["Graph path units<br/>algorithm submissions"]
  node_grid_solutions["Grid search units<br/>algorithm submissions"]
  node_dp_solutions["Dynamic programming units<br/>algorithm submissions"]
  node_tree_solutions["Tree model units<br/>structural submissions"]
  node_linked_solutions["Linked-structure units<br/>structural submissions"]
  node_design_solutions["Stateful design units<br/>object submissions"]
end

subgraph group_judge["LeetCode environment"]
  node_judge_runtime{{"Judge invocation<br/>Java execution runtime"}}
  node_judge_models["Judge model types<br/>provided data structures"]
end

node_readme -->|"describes"| node_submissions
node_submissions -->|"contains examples"| node_array_solutions
node_submissions -->|"contains examples"| node_string_solutions
node_submissions -->|"contains examples"| node_search_solutions
node_submissions -->|"contains examples"| node_graph_solutions
node_submissions -->|"contains examples"| node_grid_solutions
node_submissions -->|"contains examples"| node_dp_solutions
node_submissions -->|"contains examples"| node_tree_solutions
node_submissions -->|"contains examples"| node_linked_solutions
node_submissions -->|"contains examples"| node_design_solutions
node_judge_runtime -->|"compiles and evaluates independently"| node_submissions
node_judge_models -->|"provides tree types"| node_tree_solutions
node_judge_models -->|"provides linked types"| node_linked_solutions
node_judge_models -->|"provides iterator models"| node_design_solutions

click node_readme "https://github.com/vedesh-reddy/daily-leetcode/blob/main/README.md"
click node_array_solutions "https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/02.number-of-sub-arrays-with-odd-sum-medium.java"
click node_string_solutions "https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/20.check-if-a-string-can-break-another-string-medium.java"
click node_search_solutions "https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/12.sliding-puzzle-hard.java"
click node_graph_solutions "https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/11.shortest-path-with-alternating-colors-medium.java"
click node_grid_solutions "https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/07.swim-in-rising-water-hard.java"
click node_dp_solutions "https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/15.maximum-and-sum-of-array-hard.java"
click node_tree_solutions "https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/06.binary-search-tree-to-greater-sum-tree-medium.java"
click node_linked_solutions "https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/14.linked-list-cycle-easy.java"
click node_design_solutions "https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/26.design-an-atm-machine-medium.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_readme,node_submissions,node_array_solutions,node_string_solutions,node_search_solutions,node_graph_solutions,node_grid_solutions,node_dp_solutions,node_tree_solutions,node_linked_solutions,node_design_solutions toneBlue
class node_judge_runtime,node_judge_models toneAmber
```

## Components

### Daily solution archive

Standalone Java submissions organized as numbered files.

- [Collection README](https://github.com/vedesh-reddy/daily-leetcode/blob/main/README.md): repository metadata · Identifies the archive as daily-leetcode. · `README.md`
- **Independent submissions**: Java solution files · Each file is compiled and evaluated independently.
- [Array and greedy units](https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/02.number-of-sub-arrays-with-odd-sum-medium.java): algorithm submissions · `solutions/02.number-of-sub-arrays-with-odd-sum-medium.java`
- [String transformation units](https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/20.check-if-a-string-can-break-another-string-medium.java): algorithm submissions · `solutions/20.check-if-a-string-can-break-another-string-medium.java`
- [State-space search units](https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/12.sliding-puzzle-hard.java): algorithm submissions · Encode traversal and search state internally. · `solutions/12.sliding-puzzle-hard.java`
- [Graph path units](https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/11.shortest-path-with-alternating-colors-medium.java): algorithm submissions · Build and traverse graph state within a submission. · `solutions/11.shortest-path-with-alternating-colors-medium.java`
- [Grid search units](https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/07.swim-in-rising-water-hard.java): algorithm submissions · `solutions/07.swim-in-rising-water-hard.java`
- [Dynamic programming units](https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/15.maximum-and-sum-of-array-hard.java): algorithm submissions · Compute combinatorial or optimization results internally. · `solutions/15.maximum-and-sum-of-array-hard.java`
- [Tree model units](https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/06.binary-search-tree-to-greater-sum-tree-medium.java): structural submissions · `solutions/06.binary-search-tree-to-greater-sum-tree-medium.java`
- [Linked-structure units](https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/14.linked-list-cycle-easy.java): structural submissions · `solutions/14.linked-list-cycle-easy.java`
- [Stateful design units](https://github.com/vedesh-reddy/daily-leetcode/blob/main/solutions/26.design-an-atm-machine-medium.java): object submissions · Implement problem-required stateful objects. · `solutions/26.design-an-atm-machine-medium.java`

### LeetCode environment

External runtime, inputs, and model definitions.

- **Judge invocation**: Java execution runtime · Supplies inputs, invokes solution methods, and checks results.
- **Judge model types**: provided data structures · Provides required tree, list, iterator, and multilevel-node types.

## Connections

- Collection README → Independent submissions: describes
- Independent submissions → Array and greedy units: contains examples
- Independent submissions → String transformation units: contains examples
- Independent submissions → State-space search units: contains examples
- Independent submissions → Graph path units: contains examples
- Independent submissions → Grid search units: contains examples
- Independent submissions → Dynamic programming units: contains examples
- Independent submissions → Tree model units: contains examples
- Independent submissions → Linked-structure units: contains examples
- Independent submissions → Stateful design units: contains examples
- Judge invocation → Independent submissions: compiles and evaluates independently · Independent evaluation avoids duplicate Solution class conflicts.
- Judge model types → Tree model units: provides tree types
- Judge model types → Linked-structure units: provides linked types
- Judge model types → Stateful design units: provides iterator models