Codeforces Round #615 (Div. 3) D. MEX maximizing（思维好题）
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题意：给定q次询问和x，每次询问都会加入一个数到数组（数组初始为空），你每次可以对数组中的任一数进行+x和-x的操作，问你当前数组未出现的最小整数。 思路：连E和F都做出来了居然卡在这一题，感觉自己好像思维能力和观察能力不行。。。。 其实每次可以无限加X和减去X就应该想到结果只会对x的模数有影响，找空位就行了。 #includeusing namespace std;const int maxn=4e5+10;int a[maxn];int main(){ int q,x,t,ans=0; scanf("%d%d",&q,&x); while(q--) { scanf("%d",&t); a[t%x]++; while(a[ans%x]) a[ans%x]--,ans++; printf("%d\n",ans); } }
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