摘要：
1.two sum 思路：一次遍历+hash class Solution { public: vector<int> twoSum(vector<int>& nums, int target) { unordered_map<int,int> a; vector<int> b; for(int i 阅读全文
摘要：
配置maven后，运行命令mvn -v的时候，竟然报错。错误信息如下： Error: JAVA_HOME not found in your environment.Please set the JAVA_HOME variable in your environment to match thel 阅读全文
摘要：
链接：https://ac.nowcoder.com/acm/contest/5477/F来源：牛客网 题目描述 天才程序员菜哭武和石头组队参加一个叫做国际排列计算竞赛 (International Competition of Permutation Calculation, ICPC) 的比赛， 阅读全文
摘要：
1.定义： 对于已知有n个元素的离线数列d，我们可以建立记录它每项与前一项差值的差分数组f：显然，f[1]=d[1]-0=d[1];对于整数i∈[2,n]，我们让f[i]=d[i]-d[i-1]。 2.简单性质： (1)计算数列各项的值：观察d[2]=f[1]+f[2]=d[1]+d[2]-d[1] 阅读全文
摘要：
一般这个错误是由密码错误引起，解决的办法自然就是重置密码。 假设我们使用的是root账户。 1.重置密码的第一步就是跳过MySQL的密码认证过程，方法如下： 去mysql安装下的my.ini文件，右键记事本打开，然后找到 [mysqld] ，在[mysqld]后面添加一行 skip-grant-ta 阅读全文
摘要：
The next lecture in a high school requires two topics to be discussed. The ii-th topic is interesting by aiai units for the teacher and by bibi units 阅读全文
摘要：
Andrewid the Android is a galaxy-famous detective. He is now investigating the case of vandalism at the exhibition of contemporary art. The main exhib 阅读全文
摘要：
Vasya has a string ss of length nn. He decides to make the following modification to the string: Pick an integer kk, (1≤k≤n1≤k≤n). For ii from 11 to n 阅读全文
摘要：
Tanya wants to go on a journey across the cities of Berland. There are nn cities situated along the main railroad line of Berland, and these cities ar 阅读全文
摘要：
Description An army of ants walk on a horizontal pole of length l cm, each with a constant speed of 1 cm/s. When a walking ant reaches an end of the p 阅读全文