Alternative for nested loop

Question

Do you know a solution to replace nested loop to reach O(n) time complexity.
here's the problem:
for(i=0; i<10; i++)
{
for(j=0; j<10-i; j++)
{
Console.WriteLine(i.ToString() + " " + j.ToString());
}
}
and would you please give me the sample of solution code?

Answer 1

yes we can use nested for loop, but will reduce performance.

Answer 2

I think it depends on what you want to do with them, because, lets say you want to store numbers in a bidimensional array, you can use nested loops to reach every single position in the array, that is the easy and short way to do it.