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vedgar/rotate matrix in place

Created July 29, 2017 13:15
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rotate matrix in place
for i in range(len(a) >> 1):
for j in range(len(a[i])+1 >> 1):
a[i][j], a[j][~i], a[~i][~j], a[~j][i] = \
a[j][~i], a[~i][~j], a[~j][i], a[i][j]
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