[입력 예시]
4
[출력 예시]
1
1 2
1 2 3
1 2 3 4
print( )의 들여쓰기는 참 중요해
a = int(input())
for i in range(1, a+1):
for k in range(1, i+1):
print(k, end=' ')
print()
4
1 1 2 1 2 3 1 2 3 4
a = int(input())
for i in range(1, a+1):
for k in range(1, i+1):
print(k, end=' ')
print()
4
1
1 2
1 2 3
1 2 3 4