What's the logic behind that when sir told 1 should be between 10-9 and 10+9, What's logic between them?

#1

What’s the logic behind that when sir told 1 should be between 10-9 and 10+9, What’s logic between them?

#2

@cbcao263
here we are finding maximum increasing subsequence, so for any number to start it lies between 10^-9 and 10^9. and end element is always less than 10^9

#3

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