线段树记录区间中已取走的个数 include<cstdio> include<cstring> include<algorithm> defineN100100 usingnamespacestd; intn; intnow; longlongans; inta[N],pos[N]; structTree{ intl,r,num; }tree[N3]; voidbuild(ints,intt,intid){ tree[id].l=s,tree[id].r=t,tree[id].num=0; if(s!=t){ intmid=(s+t)>>1;...