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识别 {{ 1, 2, 3 }, {0, 1, 4 }, {0, 0, 1 }} 是否上三角。逆也上三角?
识别 {{ 1, 2, 3 }, {0, 1, 4 }, {0, 0, 1 }} 是否上三角。逆也上三角?
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