The biggest problem is determining the type of first input of each line.
Solu:
Character.isAlphebet( ) // true for letter
Character.isDigit( ) // true for digit
After the judge, choose to input the next 2 or 1 integer.
Basic idea: Two and only two lines can create an intersection according to the instruction. So it is basically a permutations and combinations question: how many sets of 4 vertex does the graph have? Since the sequence of the 4 vertex won’t affect the fi…
重装MySql57 1.备份数据库2.重装Mysql5.7【错误1】【特别注意】my.ini文件的配置参考链接参考链接【错误2】mysql忘记密码、并修改密码参考链接【错误3】MySQL报错“Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggre”参考链接1.备份数据库 参考…