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a_yadvichuk

symmetrical

Apr 30th, 2019
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Python 0.31 KB | None | 0 0
  1. n = int(input())
  2. a = []
  3. for i in range(n):
  4.     row = input().split()
  5.     for j in range(n): row[j] = int(row[j])
  6.     a.append(row)
  7. m = 0
  8. for i in range(1, n):
  9.     k = 0
  10.     for j in range(i):
  11.         if (a[i][j] == a[j][i]): k = k+1;
  12.     if k == i: m = m+1
  13. if (m == n-1): print('yes')
  14. else: print('no')
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