双亲表示法：

typedef int ElemType;

#define MAX_TREE_SIZE 100
typedef struct {
    ElemType data;
    int parent;
}PTNode;
typedef struct {
    PTNode nodes[MAX_TREE_SIZE];
    int n;
}PTree;

孩子兄弟表示法：

typedef int ElemType;

typedef struct CSNode {
    ElemType data;
    struct CSNode *firstchild, *nextsibling;
}CSNode, *CSTree;