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btree *stack[20], *p£» int top; if (b!=null) { top=1; stack[top]=b; while (top>0) {

p=stack[top]; top--; printf(¡°%d¡±,p->data);

0 1 0 1 9 0 5 1 1 3 ¹þ·òÂü±àÂëÊ÷

if (p->rchild!=null){

(1)___; (2)___; }

if (p->lchild!=null) {

(3)___; (4)__; } } } }

(1)top++

(2) stack[top]=p->rchild (3)top++

(4)stack[top]=p->lchild

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