4716    A Computer Graphics Problem     
签到题目，模拟。
4717    The Moving Points  
求n个点的最大距离最小值，三分时间即可       
4718    The LCIS on the Tree   
LCT动态树       
4719    Oh My Holy FFF        
4720    Naive and Silly Muggles
求三角形外心为圆心的圆，简单几何题目。       
4721    Food and Productivity         
4722    Good Numbers  
基础数位dp        
4723    How Long Do You Have to Draw          
4724    If You Know This,You Must Have NO GF          
4725    The Shortest Path in Nya Graph 
特殊建图，优先队列版Dijkstra       
4726    Kia's Calculation
贪心，特殊处理第一位，剩下的往最大的贪。         
4727    The Number Off of FFF       
签到题目，暴力。