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70分暴力：

源代码：

#include<cstdio>
#define LL long long
LL m,n,Sign,i[30001];
void Read(LL &t) //读入优化，我已献上一切。
{
    t=0;
    char T=getchar();
    while (T<'0'||T>'9')
      T=getchar();
    while (T>='0'&&T<='9')
    {
        t=t*10+T-'0';
        T=getchar();
    }
}
void Qsort(LL t1,LL t2) //修改快排。
{
    LL X=t1,Y=t2,T=i[(t1+t2)>>1],t;
    do
    {
        while (i[X]<T)
          X++;
        while (i[Y]>T)
          Y--;
        if (X<=Y)
        {
            t=i[X];
            i[X]=i[Y];
            i[Y]=t;
            X++;
            Y--;
        }
    }
    while (X<=Y);
    if (X<=Sign&&X<t2)
      Qsort(X,t2);
    if (Y>=Sign&&t1<Y)
      Qsort(t1,Y);
}
int main()
{
    Read(n);
    Read(m);
    for (LL a=1;a<=n;a++)
      Read(i[a]);
    for (LL b=1;b<=m;b++)
    {
        LL T;
        Sign=b;
        Read(T);
        Qsort(1,T);
        printf("%I64d
",i[Sign]);
    }
    return 0;
}