Write a code to determing whether a binary tree is symmetric or not (symmetricity is based on data i.e., folding the tree with respect to the root node, all the leaf nodes which overlap should have same data)
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serialize binary tree
Print out all the permutations of a string.
Design an email sender that can send 100,000,000 emails. You have 5 machines how could you do it efficiently.
Implement atoi
Write a function to find the node where two linked lists meet.
judge if a tree is balanced
Given an array of integer and a value(integer), find all the pairs of integers in the array that sum up to the value.
In linux, a folder consists of 10000 files and some files contain US phone numbers. What would you do to display the names of files containing US phone numbers?
1. Find out that data in a linked list is a palindrome
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