七年之后

2013年12月15日

摘要： Given a matrix ofmxnelements (mrows,ncolumns), return all elements of the matrix in spiral order.For example,Given the following matrix:[ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8, 9 ]]You should return[1,2,3,6,9,8,7,4,5].class Solution {public: vector spiralOrder(vector > &matrix) { vector ans; ... 阅读全文

posted @ 2013-12-15 14:03 七年之后阅读(163) 评论(0) 推荐(0) 编辑

[LeetCode]Maximum Subarray

摘要： Find the contiguous subarray within an array (containing at least one number) which has the largest sum.For example, given the array[−2,1,−3,4,−1,2,1,−5,4],the contiguous subarray[4,−1,2,1]has the largest sum =6.思考：最大字串和。class Solution {public: int maxSubArray(int A[], int n) { int last=A[... 阅读全文

posted @ 2013-12-15 00:13 七年之后阅读(179) 评论(0) 推荐(0) 编辑

2013年12月13日

[LeetCode]Rotate Image

摘要： You are given annxn2D matrix representing an image.Rotate the image by 90 degrees (clockwise).Follow up:Could you do this in-place?思考：两步，先对角线交换再上下交换。class Solution {public: void rotate(vector > &matrix) { int n=matrix.size(); int i,j; for(i=0;i<n;i++) { for(... 阅读全文

posted @ 2013-12-13 20:46 七年之后阅读(176) 评论(0) 推荐(0) 编辑

软件缺陷预测

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posted @ 2013-12-13 18:43 七年之后阅读(9) 评论(0) 推荐(0) 编辑

2013年12月12日

[LeetCode]Trapping Rain Water

摘要： Givennnon-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.Fo... 阅读全文

posted @ 2013-12-12 22:31 七年之后阅读(199) 评论(0) 推荐(0) 编辑

[LeetCode]First Missing Positive

摘要： Given an unsorted integer array, find the first missing positive integer.For example,Given[1,2,0]return3,and[3,4,-1,1]return2.Your algorithm should run inO(n) time and uses constant space.思考：不使用额外空间的一种途径就是利用已存在的空间。此题数组中的数放到A数组中对应的位置。class Solution {public: int firstMissingPositive(int A[], int n)... 阅读全文

posted @ 2013-12-12 18:47 七年之后阅读(189) 评论(0) 推荐(0) 编辑

[LeetCode]Combination Sum II

摘要： Given a collection of candidate numbers (C) and a target number (T), find all unique combinations inCwhere the candidate numbers sums toT.Each number inCmay only be usedoncein the combination.Note:All numbers (including target) will be positive integers.Elements in a combination (a1,a2, … ,ak) must 阅读全文

posted @ 2013-12-12 17:18 七年之后阅读(160) 评论(0) 推荐(0) 编辑

[LeetCode]Combination Sum

摘要： Given a set of candidate numbers (C) and a target number (T), find all unique combinations inCwhere the candidate numbers sums toT.Thesamerepeated number may be chosen fromCunlimited number of times.Note:All numbers (including target) will be positive integers.Elements in a combination (a1,a2, … ,ak 阅读全文

posted @ 2013-12-12 16:12 七年之后阅读(207) 评论(0) 推荐(0) 编辑

[LeetCode]Recover Binary Search Tree

摘要： Two elements of a binary search tree (BST) are swapped by mistake.Recover the tree without changing its structure.Note:A solution using O(n) space is pretty straight forward. Could you devise a constant space solution?/** * Definition for binary tree * struct TreeNode { * int val; * TreeNode... 阅读全文

posted @ 2013-12-12 15:25 七年之后阅读(164) 评论(0) 推荐(0) 编辑

[LeetCode]Validate Binary Search Tree

摘要： Given a binary tree, determine if it is a valid binary search tree (BST).Assume a BST is defined as follows:The left subtree of a node contains only nodes with keysless thanthe node's key.The right subtree of a node contains only nodes with keysgreater thanthe node's key.Both the left and ri 阅读全文

posted @ 2013-12-12 10:56 七年之后阅读(209) 评论(0) 推荐(0) 编辑

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