題目概要：
判斷矩陣是否為對稱矩陣。Ex 有一個4x4矩陣，則(1,1)→(4,4)、(1,2)→(4,3)、(1,3)→(4,2)、(1,4)→(4,1)、(2,1)→(3,4)、(2,2)→(3,3)、(2,3)→(3,2)、(2,4)→(3,1)。 (此題對稱法跟一般印象中對稱矩陣不同)
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