Why

Question

What is the problem in 9 line?🤕
https://code.sololearn.com/c92jhNvlMemf/?ref=app

Answer 1

the problem is that you try to acces a[i-1] before testing if i<n
try this instead

while i<n and a[i]>a[i-1]:

in Python, a[-1] will return the last element of the list

Answer 2

In the starting of the loop "i"=0 and you are checking ( a[i]>a[i-1] ) here " i-1" is "-1" which is not possible as array index starts from 0

Answer 3

yes, the order matters. as it's a 'and' test, if the first condition is not satisfied, the second will not be tested
but you solved it!

Answer 4

the conditions are tested from left to right, so the order matters.

Answer 5

but it’s an operator "and", not "or", if even one condition is false, then that’s it, no matter how you change their places. is not it so?

Answer 6

when you test

a[i]>a[i-1] and i<n

it will first try to get a[i] and a[i-1] then compare them, but if i>=n, a[i] will raise an error and the program will crash

but if it's

i<n and a[i] >a[i-1]

it will first test if i<n, if this condition is not satisfied, it will not try to acces a[i].

Answer 7

🙏🙏

Answer 8

Does the order of conditions in while loop change the essence?...

Answer 9

to be honest, I didn’t understand anything, removed the while loop and now everything works as it should

Answer 10

Well, yes, if one of the conditions is not satisfied, then the second one does not need to be checked. is logical. but there’s no sense in changing places, isn’t that so? 🙃

Answer 11

for sure! cool ahahahaa
it finally dawned on me

Answer 12

thank you🌚

Answer 13

Why what? And where