Content 有 \(n\) 个字符串,每次出现这个单词就把这个单词放到队列的队首(若已经出现就把原队列里面的那个单词提到队首),求最后的队列由队首到队尾的元素依次是多少. 数据范围:\(1\leqslant n\leqslant 2\times 10^5\). Solution 直接用结构体存储一下每个字符串最后出现的位置(可以用 \(\texttt{map}\) 直接映射),然后我们按出现的位置从大到小排序即可. Code #include <cstdio> #include <a…

B. Chat Order 题目连接: http://www.codeforces.com/contest/637/problem/B Description Polycarp is a big lover of killing time in social networks. A page with a chatlist in his favourite network is made so that when a message is sent to some friend, his fri…

 Chat Order Time Limit:3000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Description Polycarp is a big lover of killing time in social networks. A page with a chatlist in his favourite network is made so that when a mes…

题目链接: B. Chat Order time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Polycarp is a big lover of killing time in social networks. A page with a chatlist in his favourite network is made so t…

B. Chat Order time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Polycarp is a big lover of killing time in social networks. A page with a chatlist in his favourite network is made so that wh…

原题链接在这里:https://leetcode.com/problems/intersection-of-two-arrays/ 题目: Given two arrays, write a function to compute their intersection. Example:Given nums1 = [1, 2, 2, 1], nums2 = [2, 2], return [2]. Note: Each element in the result must be unique. T…

原题链接在这里:https://leetcode.com/problems/reconstruct-itinerary/ 题目: Given a list of airline tickets represented by pairs of departure and arrival airports [from, to], reconstruct the itinerary in order. All of the tickets belong to a man who departs fro…

Given a string, we can "shift" each of its letter to its successive letter, for example: "abc" -> "bcd". We can keep "shifting" which forms the sequence: "abc" -> "bcd" -> ... -> &quo…

上面已经介绍了系统的关键技术,下面对具体实现进行详解: 1.开发时,经常需要利用一个配置文件来存储系统的参数,例如:数据库连接信息等.这样可以提高系统的可移植性,当系统的配置发生变化时,例如:更改服务器,就不用修改散布在各个页面的数据库连接信息,而只需修改配置文件即可. 下面创建一个系统配置文件sys_conf.inc,用来保存数据库连接信息: <!--sys_conf.inc:系统配置文件------------------------------> <?php //数据库配置全局变量…

Sequence Swapping Time Limit: 1 Second      Memory Limit: 65536 KB BaoBao has just found a strange sequence {<, >, <, >, , <, >} of length  in his pocket. As you can see, each element <, > in the sequence is an ordered pair, where…

题目: 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 keys less than the node's key. The right subtree of a node contains only nodes with…

排序基础 排序方法分两大类,一类是比较排序,快速排序(Quick Sort).归并排序(Merge Sort).插入排序(Insertion Sort).选择排序(Selection Sort).希尔排序(Shell Sort).堆排序(Heap Sort)等属于比较排序方法,比较排序方法理论最优时间复杂度是O(nlogn),各方法排序过程和原理见  可视化过程. 另一类是非比较排序,被排序元素框定范围的前提下可使用非比较排序方法,例如桶排序(Bucket Sort).计数排序(Counting…

题目来源 https://leetcode.com/problems/binary-tree-level-order-traversal-ii/ Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root). 题意分析 Input: binary tree Output:…

题目来源 https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/ Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and alternate between). 题意分…

题目来源 https://leetcode.com/problems/binary-tree-level-order-traversal/ Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). 题意分析 Input: 一个二叉树 Output:一个每层数值组合的list Conditions:层次遍历 题目思路 采用…

Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). For example:Given binary tree {3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7 return its level order traversal as: [ [3], [9,20], [15,7] ] co…

题目: Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root). For example:Given binary tree {3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7 return its bottom-up level orde…

题目: Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). For example:Given binary tree {3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7 return its level order traversal as: [ [3], [9,20], [15,7]…

1.题目描述 2.题目分析 先遍历,再反转. 3.代码 vector<vector<int>> levelOrderBottom(TreeNode* root) { vector<vector<int>> ans; if (root == NULL) return ans; queue<TreeNode*> q; q.push(root); vector<int> v; while (!q.empty()) { int size =…

1.题目描述 2.问题分析 利用先进先出队列解决问题. 3.代码 vector<vector<int>> levelOrder(Node* root) { vector<vector<int>> v; if (root == NULL) return v; queue<Node*> q; q.push(root); vector<int> v1; while (!q.empty()) { int size = q.size(); ;…

1.题目描述 2/问题分析 利用中序遍历,然后重新构造树. 3.代码 TreeNode* increasingBST(TreeNode* root) { if (root == NULL) return NULL; vector<int> v; inorder(root,v); TreeNode* dummy = ); TreeNode *p = dummy; for (vector<int>::iterator it = v.begin(); it != v.end(); it+…

进行分析后,发现最大收益可以转化为最小代价,那么我们就可以考虑用最小割来解决这道题. 先算出总收益\(sum\),总收益减去最小代价即为答案. 然后考虑如何建图,如何建立最小割的模型. 发现一个任务最终的处理只有两种情况: ① 不完成这个任务,那么我们需要支付\(val\)的代价. ② 完成这个任务,若任务中某个工序用租的方式来解决,则需要支付其租金的代价,若用买的方式来解决,则需要支付其购买费用的代价,且以后可以使用这台机器. 那么最小割的模型就可以建立了. 从源点\(S\)向每个任务连边,容…

val = $value; } * } */ class Solution { private $vals = []; /** * @param TreeNode $root * @return Integer[][] */ function levelOrderBottom($root) { $this->preOrder($root, 0); return array_reverse($this->vals); } function preOrder($node, $level){ if(…

题目描述 Lena喜欢秩序井然的生活.一天,她要去上大学了.突然,她发现整个房间乱糟糟的--她的手提包里的物品都散落在了地上.她想把所有的物品都放回她的手提包.但是,这里有一点问题:她一次最多只能拿两个物品,她也不能移动她的手提包.并且,因为她爱整洁的习惯,如果她拿起了一个物品,她也不能将它放在其他地方,除非放回她的手提包. Lena把她的房间划分为了一个平面直角坐标系.现在Lena给你她的手提包和每个散落的物品的坐标(当然,一开始的时候她就和手提包站在一个地方).她从坐标 $(x1,y1)$…

Content 账单里面有 \(n\) 条记录,只有卖出记录和买入记录两种,并且都包含两个信息 \(p_i,q_i\),现在根据这些记录,请执行如下操作: 将所有 \(p_i\) 相等的同种记录合并(就是只能卖出记录和卖出记录合并,买入记录和买入记录合并,不能将卖出记录和买入记录合并). 合并之后,将所有 \(p_i\) 最小的 \(s\) 条卖出记录按照 \(p_i\) 降序输出.将所有 \(p_i\) 最大的 \(s\) 条买入记录按照 \(p_i\) 降序输出. 笔者提醒:买入卖出记录可能…

我要举报本次校赛出题人的消极出题!!! 官方题解请戳:http://3.scnuacm2015.sinaapp.com/?p=89(其实就是一堆代码没有题解) A. 树链剖分数据结构板题 题目大意:我没看,看不懂. 基本思路:我不会. 参考代码:找Oyk老师和Czj老师去. B. The background of water problem 题目大意(大写加粗的水题):给定$N$个学生和他们$K$个科目的成绩$S_i$,再给出各科目$K_i$的权重顺序$Q_i$,求排名之后,拥有id为$X$的…

Sept. 13, 2015 Spent more than a few hours to work on the leetcode problem, and my favorite blogs about this problems: 1. http://siddontang.gitbooks.io/leetcode-solution/content/tree/construct_binary_tree.html 2.http://blog.csdn.net/linhuanmars/artic…

原题链接在这里:https://leetcode.com/problems/binary-tree-vertical-order-traversal/ 题目: Given a binary tree, return the vertical order traversal of its nodes' values. (ie, from top to bottom, column by column). If two nodes are in the same row and column, th…

catalogue . Abstract . INTRODUCTION . 通信协议Connection Registration Action . 通信协议Channel operations Action . 通信协议Heart Beat Action . 示例代码 . 基于IRC的中控网络 0. Abstract The IRC protocol was developed over the last 4 years since it was first implemented as a…

Binary Tree Zigzag Level Order Traversal Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and alternate between). For example: Given binary tree {3,9,20,…