user695652 - 4 months ago 24

C++ Question

Given a sorted

`std::vector<int>`

I am aware that I can implement this using a binary search but I am interested if there is any function in the standard library, similar to the unary

`find_if`

Answer

You should find the lower_bound of 0:

```
auto iter = std::lower_bound(vec.begin(), vec.end(), 0);
```

the resulting iterator will point to the earliest position where you can insert 0 without disrupting the ordering of elements. Similarly, `upper_bound`

will return the right-most such iterator.

The runtime of the algorithm is `O(logN)`