档案日期2015的39

题目描述：

According to the Wikipedia's article: "The Game of Life, also known simply as Life, is a cellular automaton devised by the British mathematician John Horton Conway in 1970."

Given a board with m by n cells, each cell ...

1. 备份数据库，然后执行MySQL数据库表变更，SQL如下：

ALTER TABLE `zinnia_entry`
     ADD COLUMN `image_caption` LONGTEXT NULL AFTER `detail_template`,
     ADD COLUMN `lead` LONGTEXT NULL AFTER `image_caption`,
     ADD COLUMN `publication_date` DATETIME NULL AFTER `lead`;

ALTER TABLE `zinnia_entry` ADD INDEX `zinnia_entry_slug_4505cfe2_idx` (`slug`, `publication_date`);

ALTER TABLE `zinnia_entry` ADD ...

题目描述：

Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate element must exist. Assume that there is only one duplicate number, find the duplicate one.

Note ...