Coding Patterns

Master coding patterns through learning, drilling, and solving puzzles.

Total Patterns

Examples

DFS on Tree

def dfs(node):
    if not node:
        return
    process(node)
    dfs(node.left)
    dfs(node.right)

DFS on Graphs

def dfs(node, visited):
    if node in visited:
        return
    visited.add(node)
    for neighbor in node.neighbors:
        dfs(neighbor, visited)

Practice Mode

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Hard Mode

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100%

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DFS: DFS on Tree

Hard Mode Active

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def dfs(node):
    if not node:
        return
    process(node)
    dfs(node.left)
    dfs(node.right)

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Patterns

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Coding Patterns

DFS

DFS on Tree

DFS on Graphs

BFS

Sliding Window

Backtracking

Binary Search

Stacks

Tries

Topological Sort

Union-Find

Prefix Sum

Dynamic Programming

Two Pointers

Sorting

Practice Mode

DFS: DFS on Tree

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Patterns