[黑科技]pb_ds库(G++)

 1 #include<stdio.h>
 2 #include<ext/pb_ds/assoc_container.hpp>
 3 #include<ext/pb_ds/hash_policy.hpp>
 4 __gnu_pbds::gp_hash_table<int, bool> gf;
 5 inline int in()
 6 {
 7     int res=0;
 8     char c=getchar();
 9     while(c<‘0‘||c>‘9‘) c=getchar();
10     while(c>=‘0‘&&c<=‘9‘) res=res*10+c-48,c=getchar();
11     return res;
12 }
13 int main()
14 {
15     int n = in(), m = in(), x;
16     while(n--){
17         x = in();
18         gf[x] = true;
19     }
20     while(m--){
21         x = in();
22     puts(gf[x] ? "YES" : "NO");
23     }
24     return 0;
25 }