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The string"PAYPALISHIRING"is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font fo... 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.两数相除，不能用*,/,% 那么只能用位移运算了，注意边界条件防止溢出，代码如下... 阅读全文
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Implementint sqrt(int x).Compute and return the square root ofx.简单的二分法，注意mid应该选为long，否则容易溢出： 1 class Solution { 2 public: 3 int mySqrt(int x) { 4 ... 阅读全文
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Related to questionExcel Sheet Column TitleGiven a column title as appear in an Excel sheet, return its corresponding column number.For example: A ... 阅读全文
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Compare two version numbersversion1andversion2.Ifversion1>version2return 1, ifversion1 val2)20 return 1;21 else if(val1 < ... 阅读全文
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Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the 阅读全文
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Write a function to find the longest common prefix string amongst an array of strings.求很多string的公共前缀，用个两重循环就可以，代码如下： 1 class Solution { 2 public: 3 ... 阅读全文
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Given a linked list, return the node where the cycle begins. If there is no cycle, returnnull.Note:Do not modify the linked list.Follow up:Can you sol... 阅读全文
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Given a collection of numbers that might contain duplicates, return all possible unique permutations.For example,[1,1,2]have the following unique perm... 阅读全文
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Given a collection of numbers, return all possible permutations.For example,[1,2,3]have the following permutations:[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,... 阅读全文