0_0_22580297_2487.cpp: In function 'int main()': 0_0_22580297_2487.cpp:60:31: error: 'n1' was not declared in this scope for(int i = mx+1; i < n1; ++i) ^ 0_0_22580297_2487.cpp:62:15: error: 'n1' was not declared in this scope FFT(y,n1,1); ^