多...多组数据...
awsl
死命的MLE，原来是忘记清空数组了....
左偏树模板？
对于每一个操作，我们把两个节点$x,y$的祖先$fx,fy$找到，然后把他们的左右儿子分别合并
最后把$v[fx],v[fy]$分别>>1再合并回去就好了
1 // luogu-judger-enable-o2 2 #include<bits/stdc++.h> 3 #define writeln(x) write(x),puts("") 4 #define writep(x) write(x),putchar(' ') 5 using namespace std; 6 inline int read(){ 7 int ans=0,f=1;char chr=getchar(); 8 while(!isdigit(chr)){if(chr=='-') f=-1;chr=getchar();} 9 while(isdigit(chr)){ans=(ans<<3)+(ans<<1)+chr-48;chr=getchar();} 10 return ans*f; 11 }void write(int x){ 12 if(x<0) putchar('-'),x=-x; 13 if(x>9) write(x/10); 14 putchar(x%10+'0'); 15 }const long M=1e5+5; 16 int son[M][2],dis[M],v[M],rt[M],n,m; 17 int Find(int x){if(rt[x]==x)return x;return rt[x]=Find(rt[x]);} 18 #define ls son[x][0] 19 #define rs son[x][1] 20 int Merge(int x,int y){ 21 if(!x||!y) return x+y; 22 if(v[x]<v[y]) swap(x,y); 23 rs=Merge(rs,y); 24 if(dis[ls]<dis[rs]) swap(ls,rs); 25 rt[ls]=rt[rs]=rt[x]=x; 26 dis[x]=dis[rs]+1; 27 return x; 28 } 29 void Pop(int x){ 30 v[x]=-1;rt[ls]=ls,rt[rs]=rs; 31 rt[x]=Merge(ls,rs); 32 } 33 signed main(){ 34 while(~scanf("%d",&n)){ 35 memset(son,0,sizeof(son)); 36 memset(v,0,sizeof(v)); 37 memset(dis,0,sizeof(dis)); 38 dis[0]=-1; 39 for(int i=1;i<=n;i++) rt[i]=i,v[i]=read(); 40 m=read(); 41 while(m--){ 42 int x=read(),y=read(); 43 int fx=Find(x),fy=Find(y); 44 if(fx==fy) puts("-1"); 45 else{ 46 v[fx]>>=1,v[fy]>>=1; 47 int tx=Merge(son[fx][0],son[fx][1]); 48 rt[son[fx][0]]=rt[son[fx][1]]=tx; 49 son[fx][0]=son[fx][1]=dis[fx]=0; 50 rt[fx]=fx; 51 int ty=Merge(son[fy][0],son[fy][1]); 52 rt[son[fy][0]]=rt[son[fy][1]]=ty; 53 son[fy][0]=son[fy][1]=dis[fy]=0; 54 rt[fy]=fy; 55 int root=Merge(tx,ty); 56 root=Merge(fx,root); 57 root=Merge(fy,root); 58 cout<<v[root]<<endl; 59 } 60 } 61 } 62 return 0; 63 }