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Linux 安装ThinkPHP环境
1. 安装Nginx 2. 安装Mysql 3.安装PHP 4. 安装Composer --确认是否安装Composer:Composer -version --下载Composer:curl -sS https://getcomposer.org/installer | php --查看Composer.phar的位置 --移动Composer，mv composer.phar /usr/local/biCodeforces Round #588 (Div. 2) B. Ania and Minimizing(构造)
链接: https://codeforces.com/contest/1230/problem/B 题意: Ania has a large integer S. Its decimal representation has length n and doesn't contain any leading zeroes. Ania is allowed to change at most k digits of S. She wants to do it in such a way that SB. Ania and Minimizing （Codeforces Round #588 (Div. 2) ）
Ania has a large integer SS. Its decimal representation has length nn and doesn't contain any leading zeroes. Ania is allowed to change at most kk digits of SS. She wants to do it in such a way that SS still won't contain any leading zeroes