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算法：先用 givens正交变换 把 矩阵P和Q 变成上三角矩阵P’，Q’，P’，Q’对角线为正数 P’=X*P， Q’=Y*Q ，X,Y是正交矩阵 当且仅当P’==Q’ 有解 ans=rev(Y)*X 一开始看着道题 还以为要gauss_elimination完全没有必要 Followed by:
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