Ответы на вопрос:
n = int(input())
arr = [[int(elem) for elem in input().split()] for i in range(n)]
for i in range(n):
arr[i][i], arr[n-i-1][i] = arr[n-i-1][i], arr[i][i]
for i in range(n):
print(*arr[i])
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