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Given two wordsword1andword2, find the minimum number of steps required to convertword1toword2. (each operation is counted as 1 step.)You have the fol... 阅读全文
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Given a linked list and a valuex, partition it such that all nodes less thanxcome before nodes greater than or equal tox.You should preserve the origi... 阅读全文
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Given two stringssandt, write a function to determine iftis an anagram ofs.For example,s= "anagram",t= "nagaram", return true.s= "rat",t= "car", retur... 阅读全文
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Implementint sqrt(int x).Compute and return the square root ofx.思路： 突然发现，二分真TM的是万能的。还有牛顿迭代法，数学的东西，头疼不想看了。还有传说中的“魔数”法，比math库效率都高，试了下RE - -。C++: 1 clas... 阅读全文
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Implement pow(x,n).思路： 实现pow(x,n)函数。首先，可以n次连乘x，但是这样太慢了。加速：2^10 -> 4^5 -> 16^2 * 4 ->256^1 * 4C++: 1 class Solution { 2 public: 3 double myPow(dou... 阅读全文
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Implement a basic calculator to evaluate a simple expression string.The expression string contains onlynon-negativeintegers,+,-,*,/operators and empty... 阅读全文
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Given a string of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. Th... 阅读全文
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Divide two integers without using multiplication, division and mod operator.If it is overflow, return MAX_INT.题意： 实现除法，但不允许用乘、除、以及取模运算。思路： 一下一下减必然显得... 阅读全文
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Write an efficient algorithm that searches for a value in anmxnmatrix. This matrix has the following properties:Integers in each row are sorted in asc... 阅读全文
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Given a sorted array of integers, find the starting and ending position of a given target value.Your algorithm's runtime complexity must be in the ord... 阅读全文