leetcode@ [116/117] populating Next right pointers in each Node I & II (Tree, BFS)

Source: Internet
Author: User


Follow up to Problem "populating Next right pointersin each Node".

What if the given tree could is any binary tree? Would your previous solution still work?


    • Constant extra space.

For example,
Given The following binary tree,

         1       /        2    3     /\        4   5    7

After calling your function, the tree is should look like:

         1, NULL       /        2, 3, null     /\        4-> 5, 7, NULL

/** Definition for binary tree with next pointer. * struct TREELINKNODE {* int val; * Treelinknode *left, *right, * Next * Treelinknode (int x): Val (x), left (null), Right (null), Next (null) {}}; */classNode { Public: Treelinknode*nd; intLV; Node (Treelinknode* RHS,intl): nd (RHS), LV (l) {}};classSolution { Public:    voidConnect (Treelinknode *root) {        if(!root)return; Queue<node>Q; Q.push (node (root,0)); Vector<node>VEC;  while(!Q.empty ()) {Node Top=Q.front ();            Vec.push_back (top);                        Q.pop (); intCUR_LV =top.lv; Treelinknode* Cur_nd =top.nd; if(cur_nd->left) Q.push (node (cur_nd->left, cur_lv+1)); if(cur_nd->right) Q.push (node (cur_nd->right, cur_lv+1)); }                intL =0, r =1;  while(R <vec.size ()) {vec[l].nd->next =NULL;  while(R < Vec.size () && vec[r].lv = =vec[l].lv) {vec[l].nd->next =vec[r].nd; ++l; ++R; } l=R; R= L +1; } vec[vec.size ()-1].nd->next =NULL; }};

[email protected] [116/117] Populating Next right pointers in each Node I & II (Tree, BFS)

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