13 lines
333 B
D
13 lines
333 B
D
T[][] comb(T)(in T[] arr, in int k) pure nothrow {
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if (k == 0) return [[]];
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typeof(return) result;
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foreach (immutable i, immutable x; arr)
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foreach (suffix; arr[i + 1 .. $].comb(k - 1))
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result ~= x ~ suffix;
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return result;
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}
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void main() {
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import std.stdio;
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[0, 1, 2, 3].comb(2).writeln;
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}
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