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Best Time to Buy & Sell Stock I

Tracks minimum buy price so far to compute maximum single transaction profit.

Time O(n) Space O(1)
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Asked in interviews at

AtlassianShopifyLinkedIn

Reference implementation (Python)

def max_profit(prices):
    min_price = float('inf')
    max_profit = 0
    for p in prices:
        if p < min_price: min_price = p
        elif p - min_price > max_profit:
            max_profit = p - min_price
    return max_profit

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<iframe src="/embed/stock-buy-sell-single" width="100%" height="380" style="border:1px solid #e6e8ec;border-radius:14px" loading="lazy" title="3D algorithm visualization by CodeWithMunnaX"></iframe>

Frequently asked

What is the time and space complexity of Best Time to Buy & Sell Stock I?

Best Time to Buy & Sell Stock I runs in O(n) time and O(1) auxiliary space.

Is the Best Time to Buy & Sell Stock I visualizer free?

The core 3D visualizer, Web Audio chimes and step intuition are free. A one-time ₹49 Pro Pass unlocks advanced algorithms, large custom arrays, Battle Arena and reel export.

Which companies ask Best Time to Buy & Sell Stock I in interviews?

Best Time to Buy & Sell Stock I shows up in interviews at Atlassian, Shopify, LinkedIn.

How does the 3D visualization of Best Time to Buy & Sell Stock I work?

Each array value becomes a 3D pillar whose height maps to its value. Comparisons glow amber, swaps flash red, and settled elements lock green while a floating pointer badge tracks the active index — synchronized line-by-line with the Python code.

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