# ftnimran/leetcode-daily-challenges architecture

> Architecture diagram of the GitHub repository ftnimran/leetcode-daily-challenges, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-26). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/ftnimran/leetcode-daily-challenges
- Repository: https://github.com/ftnimran/leetcode-daily-challenges

## Overview

This repository is a catalog of standalone JavaScript LeetCode solutions, organized by difficulty and algorithm topic. The principal workflow is a user supplying a problem’s input to its solution function and receiving that problem’s computed answer; there is no shared application runtime or common execution pipeline. The directories below represent major solution families and documented topics, not calls between solutions. Source sampling confirms examples of segment-tree, grid-search, dynamic-programming, and other algorithmic approaches, but not every listed solution’s implementation.

Main entry points: [`easy`](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/easy) (Easy solutions), [`medium`](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium) (Medium solutions), [`easy/array`](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/easy/array) (Array algorithms), [`easy/prefix-sum`](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/easy/prefix-sum) (Prefix sums)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_core["Core algorithms"]
  node_easy["Easy solutions"]
  node_medium["Medium solutions"]
  node_array["Array algorithms"]
  node_prefix["Prefix sums"]
end

subgraph group_advanced["Advanced algorithms"]
  node_dp["Dynamic programming"]
  node_backtracking["Backtracking"]
  node_greedy["Greedy methods"]
end

subgraph group_structures["Data structures"]
  node_segment["Segment trees"]
  node_hashing["Hashing"]
end

subgraph group_strings["Strings and combinatorics"]
  node_strings["String algorithms"]
  node_two_pointer["Two pointers"]
end

subgraph group_graphs["Graphs and grids"]
  node_graph["Graph problems"]
  node_grid["Grid problems"]
end

node_user(("Problem user"))
node_result["Computed answer"]

node_user -->|"provides input"| node_easy
node_user -->|"provides input"| node_medium
node_user -->|"provides input"| node_array
node_user -->|"provides input"| node_prefix
node_user -->|"provides input"| node_dp
node_user -->|"provides input"| node_backtracking
node_user -->|"provides input"| node_greedy
node_user -->|"provides input"| node_segment
node_user -->|"provides input"| node_hashing
node_user -->|"provides input"| node_strings
node_user -->|"provides input"| node_two_pointer
node_user -->|"provides input"| node_graph
node_user -->|"provides input"| node_grid
node_easy -->|"returns answer"| node_result
node_medium -->|"returns answer"| node_result
node_array -->|"returns answer"| node_result
node_prefix -->|"returns answer"| node_result
node_dp -->|"returns answer"| node_result
node_backtracking -->|"returns answer"| node_result
node_greedy -->|"returns answer"| node_result
node_segment -->|"returns answer"| node_result
node_hashing -->|"returns answer"| node_result
node_strings -->|"returns answer"| node_result
node_two_pointer -->|"returns answer"| node_result
node_graph -->|"returns answer"| node_result
node_grid -->|"returns answer"| node_result

click node_easy "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/easy"
click node_medium "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium"
click node_array "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/easy/array"
click node_prefix "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/easy/prefix-sum"
click node_dp "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/hard/dp"
click node_backtracking "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/hard/backtracking"
click node_greedy "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium/greedy"
click node_segment "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/hard/segment-tree"
click node_hashing "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium/hashing"
click node_strings "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium/string"
click node_two_pointer "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium/two-pointer"
click node_graph "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium/general"
click node_grid "https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium/binary-search"

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_easy,node_medium,node_array,node_prefix,node_user toneBlue
class node_dp,node_backtracking,node_greedy toneAmber
class node_segment,node_hashing toneMint
class node_strings,node_two_pointer toneRose
class node_graph,node_grid,node_result toneIndigo
```

## Components

### Core algorithms

- [Easy solutions](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/easy): `easy`
- [Medium solutions](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium): `medium`
- [Array algorithms](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/easy/array): `easy/array`
- [Prefix sums](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/easy/prefix-sum): `easy/prefix-sum`

### Advanced algorithms

- [Dynamic programming](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/hard/dp): `hard/dp`
- [Backtracking](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/hard/backtracking): `hard/backtracking`
- [Greedy methods](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium/greedy): `medium/greedy`

### Data structures

- [Segment trees](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/hard/segment-tree): `hard/segment-tree`
- [Hashing](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium/hashing): `medium/hashing`

### Strings and combinatorics

- [String algorithms](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium/string): `medium/string`
- [Two pointers](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium/two-pointer): `medium/two-pointer`

### Graphs and grids

- [Graph problems](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium/general): `medium/general`
- [Grid problems](https://github.com/ftnimran/leetcode-daily-challenges/tree/main/medium/binary-search): `medium/binary-search`

### Other components

- **Problem user**
- **Computed answer**

## Connections

- Problem user → Easy solutions: provides input
- Problem user → Medium solutions: provides input
- Problem user → Array algorithms: provides input
- Problem user → Prefix sums: provides input
- Problem user → Dynamic programming: provides input
- Problem user → Backtracking: provides input
- Problem user → Greedy methods: provides input
- Problem user → Segment trees: provides input
- Problem user → Hashing: provides input
- Problem user → String algorithms: provides input
- Problem user → Two pointers: provides input
- Problem user → Graph problems: provides input
- Problem user → Grid problems: provides input
- Easy solutions → Computed answer: returns answer
- Medium solutions → Computed answer: returns answer
- Array algorithms → Computed answer: returns answer
- Prefix sums → Computed answer: returns answer
- Dynamic programming → Computed answer: returns answer
- Backtracking → Computed answer: returns answer
- Greedy methods → Computed answer: returns answer
- Segment trees → Computed answer: returns answer
- Hashing → Computed answer: returns answer
- String algorithms → Computed answer: returns answer
- Two pointers → Computed answer: returns answer
- Graph problems → Computed answer: returns answer
- Grid problems → Computed answer: returns answer