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View Compilation Error

0_0_38726771_20537.cpp: In function 'll inv(const ll&, const ll&)':
0_0_38726771_20537.cpp:11:49: error: 'ksm' was not declared in this scope
   11 | inline ll inv(const ll& x, const ll& p) {return ksm(x, p - 2, p);}   //ÇóÄæÔª, pΪģ
      |                                                 ^~~


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