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- n = int(input())
- a = []
- for i in range(n):
- row = input().split()
- for j in range(n): row[j] = int(row[j])
- a.append(row)
- m = 0
- for i in range(1, n):
- k = 0
- for j in range(i):
- if (a[i][j] == a[j][i]): k = k+1;
- if k == i: m = m+1
- if (m == n-1): print('yes')
- else: print('no')
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