What are constraints that used in many code competitions?

Question

I'm so confused when I start coding on CodeChef, when I try to search on google what constraints is.. It's so complex to understand. Does anyone who can explain it?
For example: x<5<=100

Answer 1

Perhaps it should be 5 < x <= 100
It means the value of x must be greater than 5 and less than or equal to 100. So valid values of x are: 6 to 100
You'll have to check x in your code in such a way that it works for all valid values of x, and any invalid value of x (like 0, 2, 5, 101, -7 etc.) can't be applied.

Answer 2

Thank you Shamima Yasmin

Answer 3

psosibly it(5<x<=100) may be x is greater than 5 and less than or equal 100....

Answer 4

thanks