【CS Round #46 (Div. 1.5) A】Letters Deque
【Codeforces Round #432 (Div. 2) A】 Arpa and a research in Mexican wave
【Codeforces Round #432 (Div. 2) B】Arpa and an exam about geometry
【Codeforces Round #432 (Div. 1) A】 Five Dimensional Points
【2017 Multi-University Training Contest
Managing remote devices
防止表单重复提交的解决方案整理
防止表单重复提交的解决方案整理
日期格式化函数