How to make a fast search for an object with a particular value in a vector of structs or classes? c++

Question

If I have thousands of struct or class objects in a vector, how to find those that are needed, in a fast way?
For example:
Making a game, and I need fas

Answer 1

For example:

for_each(v.begin(),v.end(), [](int e) 
{
    if (e%2==1)//vector elements that are not divided by 2 without remainder
    cout<