#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <omp.h>
int xh_decide3d(const int ex[3],
             const double *f,
             const double *fpi,   /* 这里未用，Fortran 也没用到 */
             const int cxB[3],
             const int cxT[3],
             const double SoA[3],
             double *ya,
             int ordn,
             int Symmetry);
void xh_polint(const double *xa, const double *ya, double x,
                   double *y, double *dy, int ordn);

void xh_polin3(const double *x1a, const double *x2a, const double *x3a,
                   const double *ya, double x1, double x2, double x3,
                   double &y, double *dy, int ordn);