problem 1089. Duplicate Zeros 题意: solution: 其中关于虚拟新数组的下标的计算还是有点迷糊... class Solution { public: void duplicateZeros(vector<int>& arr) { int n = arr.size(); ); ; i>=; i--) { if((--m) <n) //err.... { arr[m] = arr[i]; } && (--m) <n)…

题目如下: Given a fixed length array arr of integers, duplicate each occurrence of zero, shifting the remaining elements to the right. Note that elements beyond the length of the original array are not written. Do the above modifications to the input arr…

[Problem] duplicate connection name [Solution] 在Qt上使用SQLite的时候,如果第二次使用QSqlDatabase::addDatabase()方式时,就会出现以下错误提示: QSqlDatabasePrivate::addDatabase: duplicate connection name 'qt_sql_default_connection', old connection removed. 解决方法是:先判断一下这个默认的连接名是否存在,…

[算法]回文树 #include<cstdio> #include<algorithm> #include<cstring> using namespace std; ; ];}t[maxn]; char s[maxn]; int n,len,l,sz,ans; int getfail(int x) { ]!=s[len])x=t[x].fail; return x; } void tree_work() { int x=s[++len]; l=getfail(l);…

今天分析一下duplicate symbols for architecture x86_64错误  也是困扰我一段时间   不过很幸运 在半个小时内找到了解决方案 百度上对于duplicate symbols for architecture x86_64这种错误最多的两种解决方法是: 第一:有框架文件没有包含,导入错误即解决第二:是由于我的粗心,在导入头文件时不小心把.h导入了.m文件,所以出现了上述错误,有一个duplicate的错误提示,修改了导入部分OK了. 但是..我却遇到了第三种情…

遇到引用库重复定义的问题,需要解决. 项目需要,同时引用ZBar和QQ授权登录SDK,由于二者均使用了Base64处理数据,XCode编译时报错: duplicate symbol _base64_encode in: ...\libzbar.a(symbol.o) ...\TencentOpenAPI(base64.o) 意思就是在这两个库中都定义了_base64_encode,编译器认为你重复定义了.至于为什么编译器认为重复定义,个人认为编译器编译全局变量时会根据名字进行编译,会把相同名称的…

http://www.lydsy.com/JudgeOnline/problem.php?id=1089 题意:求深度为d的n元树数目.(0<n<=32, 0<=d<=16) #include <cstdio> #include <cstring> #include <cmath> #include <string> #include <iostream> #include <algorithm> #inclu…

Contains Duplicate Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct. 思路:简单题用set bool cont…

Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id. +----+------------------+ | Id | Email | +----+------------------+ | 1 | john@example.com | | 2 | bob@example.com |…

Write a SQL query to find all duplicate emails in a table named Person. +----+---------+ | Id | Email | +----+---------+ | 1 | a@b.com | | 2 | c@d.com | | 3 | a@b.com | +----+---------+ # Write your MySQL query statement below select Email from Perso…