cs_tdfs.c
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00001 #include "cs.h"
00002 /* depth-first search and postorder of a tree rooted at node j */
00003 int cs_tdfs (int j, int k, int *head, const int *next, int *post, int *stack)
00004 {
00005     int i, p, top = 0 ;
00006     if (!head || !next || !post || !stack) return (-1) ;    /* check inputs */
00007     stack [0] = j ;                 /* place j on the stack */
00008     while (top >= 0)                /* while (stack is not empty) */
00009     {
00010         p = stack [top] ;           /* p = top of stack */
00011         i = head [p] ;              /* i = youngest child of p */
00012         if (i == -1)
00013         {
00014             top-- ;                 /* p has no unordered children left */
00015             post [k++] = p ;        /* node p is the kth postordered node */
00016         }
00017         else
00018         {
00019             head [p] = next [i] ;   /* remove i from children of p */
00020             stack [++top] = i ;     /* start dfs on child node i */
00021         }
00022     }
00023     return (k) ;
00024 }
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hogman_minimal
Author(s): Maintained by Juergen Sturm
autogenerated on Wed Dec 26 2012 15:36:47