🐍 Python Interview Preparation

Complete Python interview prep — DSA patterns, system design, coding challenges & solutions

📚 Contents

Data Structures

• Arrays & Strings
• Linked Lists
• Stacks & Queues
• Trees & Graphs
• Hash Maps
• Heaps & Priority Queues

Algorithms

• Two Pointers
• Sliding Window
• Binary Search
• Dynamic Programming
• Backtracking
• Graph BFS/DFS

Python Patterns

# Two Pointers Pattern
def two_sum_sorted(nums, target):
    left, right = 0, len(nums) - 1
    while left < right:
        total = nums[left] + nums[right]
        if total == target: return [left, right]
        elif total < target: left += 1
        else: right -= 1
    return []

# Sliding Window Pattern
def max_subarray_sum(nums, k):
    window_sum = sum(nums[:k])
    max_sum = window_sum
    for i in range(k, len(nums)):
        window_sum += nums[i] - nums[i-k]
        max_sum = max(max_sum, window_sum)
    return max_sum

# Binary Search Pattern
def binary_search(nums, target):
    left, right = 0, len(nums) - 1
    while left <= right:
        mid = (left + right) // 2
        if nums[mid] == target: return mid
        elif nums[mid] < target: left = mid + 1
        else: right = mid - 1
    return -1

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By Harsh Kumar — github.com/arya123224