I do not understand what the problem is in this code.
steven kladitis via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Thu Mar 2 19:11:24 PST 2017
void main() {
import std.stdio, std.range, std.algorithm, std.string;
const pieces = "KQRrBbNN";
alias I = indexOf;
auto starts = permutations(pieces.dup).filter!(p =>
I(p, 'B') % 2 != I(p, 'b') % 2 && // Bishop
constraint.
// King constraint.
((I(p, 'r') < I(p, 'K') && I(p, 'K') < I(p, 'R')) ||
(I(p, 'R') < I(p, 'K') && I(p, 'K') < I(p, 'r'))))
.map!toUpper.array.sort().uniq;
writeln(starts.walkLength, "\n", starts.front);
}
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