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iOS

For-in loop question....

Ok, so I have been practicing other places as well as here. I found some great practice on weheartswift.com and I came across this challenge that doesn't make much sense to me. Here is my code:

var N = 4

for i in 1...N {
    for _ in 0..<(N-i) {
        print(" ", terminator: "")
    }
    for _ in 1...i*2-1 {
        print("*", terminator: "")
    }
    print("")
}

It's supposed to (and does) print out a pyramid. I am just confused by the for loop that runs from 0..<(n-i). It has an error if it's 1..<(N-i), but I'm not sure what the difference is. Really just trying to get better at how nested loops work!