/* --- Structure of a graph --- */ typedef struct arc Arc; typedef struct graph Graph; struct arc { int eID[2], /* IDs of two extreme points */ numC, /* number of cells included in the list */ *cID; /* intersected cell list */ float value[2]; /* the maximum and minimum value */ }; struct graph { int numN, /* number of node (extrema points) */ *node; /* point ID of nodes (extrema points) */ Arc *ac; /* arc data */ };