即使你之前了解过逻辑回归,我认为这里还是有些新的、有趣的东西等着你去发现和了解,所以现在开始进入正题 逻辑回归是一个用于二分类($binary\ classification$)的算法。
mid +1; else R=mid-1; } return -1; } 废江博客 , 版权所有丨如未注明 , 均为原创丨本网站采用BY-NC-SA协议进行授权 转载请注明原文链接:Binary
Binary Search Jon Bentley以前说过类似的话:“90%的程序猿无法正确实现二分查找算法 就冲着这句话去写binary search binary_search 的算法实现部分 / ********************************************************* code writer : EOF code file : binary_search.c gmail.com description: You may have to KNOW that the @array was sequenced from min to max when you use "binary e-mail : jasonleaster@gmail.com Code description: Here is a implementation for how to do binary search in Python. ''' def binary_search(array, element): high = len(array) mid = -1 for
Special Binary String Problem: Special binary strings are binary strings with the following two properties 接着交换任意两个连续位置的special binary string,取lexicographically最大的。 各位且慢,举个例子”1010”,是special binary string,首尾的确分别是1和0,但很遗憾”01”并不是special binary string啊,那怎么用递归解决啊! 它除了首尾的子串一定是special binary string。 嘿,既然能够找到第一个count = 0的special binary string,并且确保了子问题也是special binary string,就可以递归求解了。
Solution /** * Definition for a binary tree node.
题目: Given two binary strings, return their sum (also a binary string). //十进制转二进制 string result;//结果字符串 //临时存储计算的二进制结果,计算出来的余数要reverse下 vector<int> binary quotient /= 2; } binary.push_back(remainder); vector<int>::size_type size = binary.size(); //逆序遍历binary将每个int转为char装入result中 for (size_t i = size; i ! = 0; i--) { result.push_back(binary[i - 1] + '0'); } return result
Binary String Matching 描述 Given two strings A and B, whose alphabet consist only ‘0’ and ‘1’.
Solution Recursive /** * Definition for a binary tree node. searchPath(root->right, s, result); } } }; Iterative /** * Definition for a binary
Question: Given two binary strings, return their sum (also a binary string). blen--; } return sum; } }; Anwser 2: wrong for large and large binary write int main() function return num2str( str2num(a) + str2num(b) ); } }; 注意点: 1) 思路是将binary 先转化成整数(int, long, ulong, long long等),然后相加(a + b),最后再将整数和转化回binary字符串 2) 对小数据,此方法可行(Judge Small is ok)
大家好,又见面了,我是全栈君 Given two binary strings, return their sum (also a binary string).
问题:二叉树中序遍历 递归实现 /** * Definition for binary tree * struct TreeNode { * int val; * TreeNode
给你一个按 非递减顺序 排序的整数数组 nums,返回 每个数字的平方 组成的新数组,要求也按 非递减顺序 排序。
二叉树的前序遍历 递归实现 /** * Definition for binary tree * struct TreeNode { * int val; * TreeNode
问题:二叉树的最深深度 class Solution { public: void dfs(TreeNode *root,int step,int &MAX) { if(root==NULL) { if(MAX<step) MAX=step; return ; } dfs(root->left,step+1); dfs(root->right,step+1);
题目: Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the C++参考示例代码: /** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left
这题有意思的是,并不能直接将求最大深度的max改为min就完了,有很多坑在里面。一开始我以为只要将[],[0],[1,2]等情况考虑掉就可以了,其实在只有一边又子节点的情况下,是仍然需要遍历的。 例如:
问题描述 Given a binary tree, return the inorder traversal of its nodes’ values. For example: Given binary tree [1,null,2,3], 1 \ 2 / 3 return [1,3,2]. 2. /** * Definition for a binary tree node.
题意:二叉树的最小深度 注意 1.当root为空的时候直接返回0,因为MIN赋值很大,所以如果不单独预判的话会返回MIN 2.判断树的深度应该到叶子节点,也就是左右子结点都为空的那个结点 3.树的深度的根节点深度为1 class Solution { public: void dfs(TreeNode *root,int &MIN,int step) { if(root==NULL) return ; if(root->
问题:n个结点总共有多少个二叉搜索树 分析:n=1,sum1=1 n=2,sum2=2; n=3,sum3=2(头结点为1)+1(头结点为2)+2(头结点为3) n=4,sum4=5(头结点为1,sum3)+2(头结点为2,sum1*sum2)+2(头结点为3,sum2*sum1)+5(头结点为4,sum3) n=5,sum5=14(sum4)+5(sum1*sum3)+4(sum2*sum2)+5(sum1*sum3)+14(sum4
解答 /** * Definition for a binary tree node.