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YouTubeSysSketch
Why Inserting Into an Array Is Secretly Expensive
Arrays feel fast — until you insert in the middle. In this short: * Why every array insert after index N shifts every element to the right * How that becomes O(n) time — cost that grows with your data size * How a linked list rewires just two pointers for O(1) insert, always * When to reach for each: read-heavy vs write-heavy data No code ...
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