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#include <numeric>
#include <vector>
#include <iterator>
#include <iostream>
using namespace std;
int main()
{
int ia[] = {1, 2, 5, 10};
vector<int> iv(ia, ia + 4);
vector<int> ov(iv.size());
adjacent_difference(iv.begin(), iv.end(), ov.begin());
copy(ov.begin(), ov.end(), ostream_iterator<int>(cout, " "));
cout << '\n';
adjacent_difference(iv.begin(), iv.end(), ov.begin(), minus<int>());
copy(ov.begin(), ov.end(), ostream_iterator<int>(cout, " "));
cout << '\n';
}
// Displays:
// 1 1 3 5
// 1 1 3 5
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