0_0_6817279_5716.cpp: In member function `ll Mat::det(int)':
0_0_6817279_5716.cpp:25: error: `N' undeclared (first use this function)
0_0_6817279_5716.cpp:25: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6817279_5716.cpp:27: error: `a' undeclared (first use this function)
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