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View Compilation Error

0_0_38162650_4162.cpp: In function 'void DFT(comp*, int, int)':
0_0_38162650_4162.cpp:50:27: error: 'M_PI' was not declared in this scope
  comp cur(1,0),step(cos(2*M_PI/n),sin(2*M_PI*rev/n));
                           ^


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