new solution of "Binary Tree Zigzag Level Order Traversal" #73
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haoel
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Oct 19, 2015
new solution of "Binary Tree Zigzag Level Order Traversal"
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similar as #72(level order traversal), straight forward solution.
for each row, use whether level is even or not to indicates append or prepend:
vv[level].insert(level%2 ? vv[level].begin() : vv[level].end(), p->val);