Question

How to get the number of pairwise matches between two vectors in C++

Answer 1

#include <iostream>  
#include <numeric>
#include <vector> 

using std::vector;
using std::cout;
using std::endl;

int main()
{
	vector<int> v1{ 0, 1, 2, 3, 4 } , v2{ 5, 1, 2, 6, 4 };

	int n = inner_product(v1.begin(), v1.end(), v2.begin(), 0, std::plus<>(), std::equal_to<>());

	cout << n << endl;

	return 0;
}

/*
run:

3

*/

 

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