#include <algorithm>
#include <numeric>
#include <iostream>
using namespace std;
int main()
{
const int N = 20;
int x1[N], x2[N];
for (int i = 0; i < N; ++i)
x1[i] = i;
// Compute the partial sums of 0, 1, 2, 3, ..., N - 1, putting the result inx2:
partial_sum(&x1[0], &x1[N], &x2[0]);
for (int i = 0; i < N; ++i)
cout << x2[i] << " ";
return 0;
}
/*
0 1 3 6 10 15 21 28 36 45 55 66 78 91 105 120 136 153 171 190
*/
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