How to generate all possible pairs from two vectors in C++?

Question

I have two vectors:

vector<double>vec1={1, 2, 3, 4, 5}
vector<double>vec2={6, 7, 8, 9, 10}

and I want to generate all possible pairs like:

{1,6}, {1,7}, {1,8}, {1,9}, {1, 10}, {2,6}, {2, 7}...

https://stackoverflow.com/questions/2211915/combination-and-permutation-in-c/5286517#5286517 — sehe, Sep 23 '18 at 15:25

score 0 · Accepted Answer · 2018-09-23T15:20:15.687

0

#include <vector>
#include <iostream>

int main()
{
        std::vector<int> a = {1,2,3,4,5};
        std::vector<int> b = {1,2,3,4,5};

        for(int i =0;i<a.size() ;i++)
             for(int j =0;j<a.size() ;j++)
                  std::cout << "{"<< a[i] << "," << b[j] << "} ";

}

edited Sep 23 '18 at 15:20

answered Sep 23 '18 at 10:58

5

This is wrong. You're printing the indices of the loop, not the values in the `vector`s. – Mike Borkland Sep 23 '18 at 12:44
@MikeBorkland my BAD , edited and fixed . But u could've edited it too – Sep 23 '18 at 15:21
Poor values. OP had: vectorvec1={1, 2, 3, 4, 5} vectorvec2={6, 7, 8, 9, 10} which makes it more distinctive. "noone"'s example cannot tell the difference between 1,1 and 1,1 ... – Sep 23 '18 at 15:35

How to generate all possible pairs from two vectors in C++?

1 Answers1