set(二叉搜索树)
找球号(一)
- 描述
- 在某一国度里流行着一种游戏。游戏规则为:在一堆球中,每个球上都有一个整数编号i(0<=i<=100000000),编号可重复,现在说一个随机整数k(0<=k<=100000100),判断编号为k的球是否在这堆球中(存在为"YES",否则为"NO"),先答出者为胜。现在有一个人想玩玩这个游戏,但他又很懒。他希望你能帮助他取得胜利。
- 输入
- 第一行有两个整数m,n(0<=n<=100000,0<=m<=1000000);m表示这堆球里有m个球,n表示这个游戏进行n次。
接下来输入m+n个整数,前m个分别表示这m个球的编号i,后n个分别表示每次游戏中的随机整数k - 输出
- 输出"YES"或"NO"
- 样例输入
-
6 4
23 34 46 768 343 343
2 4 23 343 - 样例输出
-
NO
NO
YES
YES#include <iostream>
#include <algorithm>
#include <cstdio>
#include <queue>
#include <set>
using namespace std;
int main()
{
set<int> p;
int x,y,i,j,q;
while(~scanf("%d%d",&x,&y)
{
for(i=;i<x;i++)
{
scanf("%d",&j);
p.insert(j);
}
for(i=;i<y;i++)
{
scanf("%d",&j);
if(p.find(j)==p.end())
cout<<"NO"<<endl;
else
cout<<"YES"<<endl;
}
}
}
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