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First solution in Clear category for Skew-symmetric Matrix by PiotrStachowiak
def checkio(matrix):
for i in range (0, len(matrix)):
if matrix[i][i]!=0:
return False
for i in range (0,len(matrix)):
for j in range(i+1,len(matrix)):
if matrix[i][j]!=-matrix[j][i]:
return False
return True
Nov. 18, 2016