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摘要： 转载自：http://blog.sina.com.cn/s/blog_90444ed201016iq6.html http://blog.csdn.net/zb1165048017/article/details/52785177 前言 最近要看一些论文做一下笔记，所以准备使用一下比较流行的Texl 阅读全文

摘要： Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1. Examples: Note: You may assume the 阅读全文

摘要： Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. The function 阅读全文

摘要： 转载自： http://blog.csdn.net/dengjianqiang2011/article/details/8753807 MATLAB矩阵操作大全 一、矩阵的表示在MATLAB中创建矩阵有以下规则：a、矩阵元素必须在”[ ]”内；b、矩阵的同行元素之间用空格（或”,”）隔开；c、矩阵的 阅读全文

摘要： 转载自：增广拉格朗日乘子法（Augmented Lagrange Method） 增广拉格朗日乘子法的作用是用来解决等式约束下的优化问题， 假定需要求解的问题如下： minimize f(X) s.t.: h(X)=0 其中，f:Rn->R; h:Rn->Rm 朴素拉格朗日乘子法的解决方案是： L( 阅读全文

摘要： Given a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C where the candidate numbers sums 阅读全文

摘要： Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telepho 阅读全文

摘要： Follow up for N-Queens problem. Now, instead outputting board configurations, return the total number of distinct solutions. 思路： 典型8皇后，回溯法，验证是否能放皇后位置， 阅读全文

摘要： The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an integer n, return all 阅读全文

摘要： Given an array of integers sorted in ascending order, find the starting and ending position of a given target value. Your algorithm's runtime complexi 阅读全文