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n = int(input())
wypisywana = 1
for i in range(n):
	for j in range(i+1):
		print(wypisywana, end = " ")
		wypisywana=wypisywana+1
	print()

Success #stdin #stdout 0.1s 14212KB

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stdout

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1 
2 3 
4 5 6 
7 8 9 10 
11 12 13 14 15

https://ideone.com/w8ii06

language:

Python 3 (python 3.12)

created:

visibility:

public

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