One Billion Nested Loop Iterations in Different Languages.

Here’s the shocking truth (for beginners):

The way you write your code can make it 100x slower or 100x faster.
• Python might take more 74 seconds.
• C++ could finish in seconds.
• But with vectorized operations, Python can match or even beat C++.

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Why? It’s all about how you loop.

Nested loops. Vectorized operations.

Think of nested loops like opening a box inside another box, over and over.
It’s slow because you’re doing the same job a billion times manually.

Vectorized operations are like a machine that opens all the boxes at once.

Why you should NEVER use nested loops (when possible):
1. It’s painfully slow.
Imagine counting grains of sand one-by-one instead of using a shovel.
2. It wastes your computer’s power.
Modern computers are built for speed, but nested loops ignore that and crawl.