19 lines
587 B
D
19 lines
587 B
D
void main(in string[] args) {
|
|
import std.stdio, std.conv, std.algorithm, std.array, std.string;
|
|
|
|
immutable n = (args.length == 2) ? args[1].to!uint : 10;
|
|
if (n == 0)
|
|
return;
|
|
|
|
auto seq = ['1'];
|
|
writefln("%2d: n. digits: %d", 1, seq.length);
|
|
foreach (immutable i; 2 .. n + 1) {
|
|
Appender!(typeof(seq)) result;
|
|
foreach (const digit, const count; seq.representation.group) {
|
|
result ~= "123"[count - 1];
|
|
result ~= digit;
|
|
}
|
|
seq = result.data;
|
|
writefln("%2d: n. digits: %d", i, seq.length);
|
|
}
|
|
}
|