head = malloc(sizeof(node_t)); heao = malloc(sizeof(node_t));\r
head->val = 0; heao->val = 9;\r
head->next=NULL; heao->next=NULL;\r
head = malloc(sizeof(node_t)); heao = malloc(sizeof(node_t));\r
head->val = 0; heao->val = 9;\r
head->next=NULL; heao->next=NULL;\r