🔒 Help

[onyx jackal]

import sys
from sys import stdin, stdout
N = int(sys.stdin.readline())
lst = [int(x) for x in sys.stdin.readline().split()]
stack = [1]
train = 2

for i in range(N):
    if len(stack) == 0:
        break
    if stack[-1] < lst[i]:
        for j in range(train, lst[i]+1):
            stack.append(j)
            train += 1
    elif stack[-1] > lst[i]:
        sys.stdout.write("No")
        sys.exit()
    else:
        stack.pop()
    stack.pop()
sys.stdout.write("Yes")

[gusty stag]

@onyx jackal

Python help channel opened

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• Ask your Python question, not if you can ask or if there's an expert who can help.
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Closes after a period of inactivity, or when you send !close.

[onyx jackal]

i solved this question without using a stack but since i gotta use a stack here i am.. 😅

the code passes every test case except 1 so im assuming its an extreme one

i think it might have something to do with the stack.pop() at the end

damn i just fixed it how do i close this

[peak spire]

Use this !close

[gusty stag]

Python help channel closed for inactivity

This help channel has been closed. Feel free to create a new post in #1035199133436354600. To maximize your chances of getting a response, check out this guide on asking good questions.