29 lines
583 B
D
29 lines
583 B
D
import std.stdio, std.algorithm, std.range, std.array;
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struct Prop {
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int[string] data;
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ref opDispatch(string s)() pure nothrow {
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return data[s];
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}
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}
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immutable code = `
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writef("% 4d", e.seq);
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if (e.seq != 1) {
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e.cnt++;
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e.seq = (e.seq & 1) ? 3 * e.seq + 1 : e.seq / 2;
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}`;
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void main() {
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auto envs = 12.iota.map!(i => Prop(["cnt": 0, "seq": i+1])).array;
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while (envs.any!(env => env.seq > 1)) {
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foreach (e; envs) {
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mixin(code);
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}
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writeln;
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}
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writefln("Counts:\n%(% 4d%)", envs.map!(env => env.cnt));
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}
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