Help in code

auto f=[&](int u){
        for (int i=2;i<=u;++i){
            if (u%i==0) return i;

What is this doing?

It’s a lambda function. It’s a little bit like a normal function, but it can steal variables from it’s surroundings. The function returns the smallest factor of u.

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So, is this like declaration? f=[&] ( )
You can read about it here. It’s called a capture, not a steal. My bad.

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