两个向量 <string> 级联

Question

I have two vectors , like this:

A ={"Sam", "Jordan", "Mike"}
B ={"Smith", "Lancaster", "Horgen"}

After Concatenation, They should look like this:

A ={"SamSmith", "JordanLancaster", "MikeHorgen"}

Basically, you combine first and last names. How do I do that?

Answer 1

Use std::transform ( live example ):

std::transform(
    begin(A), end(A), begin(B), begin(A), 
    [](const auto& s1, const auto& s2) { return s1 + s2; }
);

Answer 2

for (size_t i = 0; i < A.size() && i < B.size(); ++i)
   A[i] += B[i];

Now the A vector contains the required output.

Answer 3

It could done easily by iterating over two vectors and concatenating strings in each step and assigning result back into A ,

 typedef vector<string>::iterator VIter;

    for(VIter it1=A.begin(), it2=B.begin(); it1 != A.end(), it2 != B.end(); ++it1, ++it2)
    {
            *it1 = *it1 +*it2;
    }