Question

How to calculated the difference between elements in a vector using C++

Answer 1

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

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

/*

vec2[0] = vec1[0]
vec2[1] = vec1[1] - vec1[0]
vec2[2] = vec1[2] - vec1[1]
vec2[3] = vec1[3] - vec1[2]
...

*/

int main()
{
	vector<int> vec1 = { 1, 4, 8, 12, 20, 31 }, vec2(6);

	adjacent_difference(vec1.begin(), vec1.end(), vec2.begin());

	for (int i = 0; i < 6; i++)
		cout << vec2[i] << " ";

	cout << endl;

	return 0;
}


/*
run:

1 3 4 4 8 11

*/

 

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