# pascal.py: takes an integer n as command-line argument and writes # Pascal's triangle P_n.

import stdarray import stdio import sys

# Get n from command line, as an int. n = int(sys.argv[1])

# Construct a 2D ragged list a of integers. The list must have n + 1 rows, # with the ith (0 <= i <= n) row a[i] having i + 1 elements, each initialized # to 1. a = [1] for i in range(0, n): a[i] =

# Fill the ragged list a using the formula for Pascal's triangle # a[i][j] = a[i - 1][j - 1] + a[i - 1][j] # where 0 <= i <= n and 1 <= j < i. for i in range(...): for j in range(..., ...): a[i][j] = ...

# Write out the ragged list a, with elements separated by spaces, and each # row ending in a newline. for i in range(...): for j in range(..., ...): ...

Dont use print