Встанови відповідність var jagged = new[]{ new[]{1,2}, new[]{3}, Ar...

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var jagged = new[]{
    new[]{1,2},
    new[]{3},
    Array.Empty<int>(),
    new[]{4,5,6}
};
var flat = jagged.SelectMany(a=>a.DefaultIfEmpty(-1));

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