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View Compilation Error

0_0_36003021_17194.cpp: In function 'void FFT(Complex*, long long int, long long int)':
0_0_36003021_17194.cpp:155:30: error: 'M_PI' was not declared in this scope
         Complex wn(cos(-on*2*M_PI/h),sin(-on*2*M_PI/h));  //单位复根e^(2*PI/m)用欧拉公式展开
                              ^


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