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Algorithms & data structures

Classic patterns — search, sort, stacks, queues, and practical complexity-aware code.

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Algorithms & data structures easy

Simplify a File Path in Python with a Stack

Uses a stack to normalize an absolute Unix path by handling '.', '..', and duplicate slashes.

stack string path
Python 
from pathlib import PurePosixPath

def simplify_path(path: str) -> str:
    tokens = path.split('/')
    stack = []
    
    for token in tokens:
        if not token or token == '.':
            continue
        if token == '..':
            if stack:
                stack.pop()
        else:
            stack.append…
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