gistfile1.cpp

std::iota(xs.begin(), xs.end(), 1); //xs = 1 2 3 4 5 6 7 8 9 10

std::iota(xs.begin(), xs.end(), 10); //xs = 10 11 12 13 14 15 16 17 18 19

std::fill(xs.begin(), xs.end(), 0);
std::iota(xs.begin(), xs.begin() + xs.size() / 2, 1); //xs = 1 2 3 4 5 0 0 0 0 0

std::iota(xs.rbegin(), xs.rend(), 0); //xs = 9 8 7 6 5 4 3 2 1 0

std::iota(xs.rbegin(), xs.rend(), 100); //xs = 109 108 107 106 105 104 103 102 101 100