8 lines
240 B
JavaScript
8 lines
240 B
JavaScript
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function combinations(k, arr, prefix = []) {
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if (prefix.length == 0) arr = [...Array(arr).keys()];
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if (k == 0) return [prefix];
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return arr.flatMap((v, i) =>
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combinations(k - 1, arr.slice(i + 1), [...prefix, v])
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);
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}
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