ChatGrabChatGPT · Claude · Gemini
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# Binary search in C++
*Exported from Claude on November 9, 2026*
---
### You
How do I write binary search in C++?
---
### Claude
Here is a clean **iterative** version. Complexity is $O(\log n)$.
```cpp
int bs(const std::vector<int>& a, int x) {
int lo = 0, hi = (int)a.size() - 1;
...
}
```
| Case | Result |
| --- | --- |
| found | index |
| missing | -1 |
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Five ways to save a ChatGPT chat, from the built-in data export to one-click Markdown and PDF, and which one to use when.
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