Compilare: user.cpp: In function ‘void lg_power(double (*)[31], long long int)’: user.cpp:23:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘int main()’: user.cpp:88:34: warning: format ‘%Lf’ expects argument of type ‘long double’, but argument 2 has type ‘double’ [-Wformat=] printf("%.3Lf ",sol[0][i]); ^ user.cpp:77:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp:74:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecu.out","w",stdout); ^