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function f(arr){
return Array.from({length:Math.max(...arr)+1}, (v,k) => k)
}
console.log(f([1,2,4,5,7]))
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function f(arr){
return Array.from({length:Math.max(...arr)+1}, (v,k) => k)
}
console.log(f([1,2,4,5,7]))
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[ 0, 1, 2, 3, 4, 5, 6, 7 ]
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