2016-2017 ACM-ICPC, Asia Tsukuba Regional Contest
题目链接:http://codeforces.com/gym/101158A签到题#includeusingnamespacestd;inta[200010],b[200010];intmain(){intn,m;scanf("%d%d",&n,&m);memset(a,0,sizeof(a));for(inti=1;i=1;i--)if(a[b[i]]==0){a[b[i]]=1;printf(