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顾名思义，贪心算法总是作出在当前看来最好的选择。也就是说贪心算法并不从整体最优考虑，它所作出的选择只是在某种意义上的局部最优选择。当然，希望贪心算法得到的最终结果也是整体最优的。虽然贪心算法不能对所有问题都得到整体最优解，但对许多问题它能产生整体最优解。如单源最短路经问题，最小生成树问题等。在一些情 阅读全文
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Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transaction 阅读全文
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Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example:Given a = 1 and b = 2, return 3. 此题讲解全部都在bit m 阅读全文
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WIKI Bit manipulation is the act of algorithmically manipulating bits or other pieces of data shorter than a word. Computer programming tasks that req 阅读全文
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You are given two non-empty linked lists representing two non-negative integers. The most significant digit comes first and each of their nodes contai 阅读全文
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You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contai 阅读全文
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Given two binary strings, return their sum (also a binary string). For example,a = "11"b = "1"Return "100". 此题主要考察数学知识，这里面注意，如果String的值要不断的改变的话，就最好用St 阅读全文