题目链接：https://codeforces.com/contest/1862/problem/D题目：思路讲解：首先观察样例和题目不难看出，x个不重复的数字一共能组成x(x-1)/2个数组，而当有重复的数字出现的时候，就只能多组成一个数组，那思路就很明确了，先找出最多能有几个不重复的数字，之后再加上需要完成的数组和已有的数

Therearemanydifferentwaystoprepareadeliciouslemoncheesecake.Hereisonepopularrecipethatyoucantry:Ingredients:21/4cupsgrahamcrackercrumbs(about150crackers)3tablespoonssugar8ozcreamcheese,softened1cupgranulatedsugar1

Itisaswelteringsummerday,andaboywantstobuysomeicecreambars.Atthestore,thereare n icecreambars.Youaregivenanarray costs oflength

matterWhat'sthematter? childrenchildkidkids tiredI'mtired.Areyoutired?I'mnottired. boy thirstyHeisthirsty.Drinkwheneveryoufeel