That is, if you have an array with three elements that are numbered 0, 1, and 2, you can create element 50 without worrying about elements 3 through 49.

 
  • 那就是说,如果你有一个包含数字0,1,2这三个数字的数组,你可以创建一个50个元素的数组,不用担心3到49的元素。
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