On Monday, 25 May 2015 at 15:06:45 UTC, Alex Parrill wrote:
Hint: Use `cartesianProduct` [1] with three iota ranges to
replace the foreachs, and `filter` to replace the if
[1]
http://dlang.org/phobos/std_algorithm_setops.html#.cartesianProduct
Thank you. Is it possible to replace the loop `foreach` function
`each` or `chunkBy` with the auxiliary functions?
import std.stdio, std.algorithm, std.range;
void main() {
const x = 12, y = 65, z = 50, s = 1435;
auto a = iota(0, x + 1);
foreach (idx; cartesianProduct(a, a, a).filter!(i => i[0] *
(y + 3 * z) + i[1] * (y + 2 * z) + i[2] * (y + z) == s)) {
writeln(idx[0] + idx[1] + idx[2]);
writeln(idx[0] * 3 + idx[1] * 2 + idx[2]);
writeln(idx[0] * 3 + idx[1] * 2 + idx[2]);
writeln(idx[0], idx[1], idx[2]);
}
}
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http://rextester.com/HZP96719
