模板题（HDU1512）：
1 #include<iostream> 2 #include<algorithm> 3 #include<cstdio> 4 #include<cstring> 5 #include<cmath> 6 #include<cstdlib> 7 #include<vector> 8 using namespace std; 9 typedef long long ll; 10 typedef long double ld; 11 typedef pair<int,int> pr; 12 const double pi=acos(-1); 13 #define rep(i,a,n) for(int i=a;i<=n;i++) 14 #define per(i,n,a) for(int i=n;i>=a;i--) 15 #define Rep(i,u) for(int i=head[u];i;i=Next[i]) 16 #define clr(a) memset(a,0,sizeof(a)) 17 #define pb push_back 18 #define mp make_pair 19 #define fi first 20 #define sc second 21 #define pq priority_queue 22 #define pqb priority_queue <int, vector<int>, less<int> > 23 #define pqs priority_queue <int, vector<int>, greater<int> > 24 #define vec vector 25 ld eps=1e-9; 26 ll pp=1000000007; 27 ll mo(ll a,ll pp){if(a>=0 && a<pp)return a;a%=pp;if(a<0)a+=pp;return a;} 28 ll powmod(ll a,ll b,ll pp){ll ans=1;for(;b;b>>=1,a=mo(a*a,pp))if(b&1)ans=mo(ans*a,pp);return ans;} 29 void fre() { freopen("c://test//input.in", "r", stdin); freopen("c://test//output.out", "w", stdout); } 30 //void add(int x,int y,int z){ v[++e]=y; next[e]=head[x]; head[x]=e; cost[e]=z; } 31 int dx[5]={0,-1,1,0,0},dy[5]={0,0,0,-1,1}; 32 ll read(){ ll ans=0; char last=' ',ch=getchar(); 33 while(ch<'0' || ch>'9')last=ch,ch=getchar(); 34 while(ch>='0' && ch<='9')ans=ans*10+ch-'0',ch=getchar(); 35 if(last=='-')ans=-ans; return ans; 36 } 37 const int N=100005; 38 struct LH{ 39 int v,l,r,f,dis; 40 }heap[N]; 41 int n; 42 inline int getf(int x){ 43 if (heap[x].f==x) return x; 44 else return getf(heap[x].f); 45 } 46 inline int Meg(int x,int y){ 47 if (!x) return y; if (!y) return x; 48 if (heap[x].v<heap[y].v) swap(x,y); 49 heap[x].r=Meg(heap[x].r,y); 50 heap[heap[x].r].f=x; 51 if (heap[heap[x].l].dis<heap[heap[x].r].dis) swap(heap[x].l,heap[x].r); 52 if (heap[x].r==0) heap[x].dis=0; 53 else heap[x].dis=heap[heap[x].r].dis+1; 54 return x; 55 } 56 inline int Del(int x){ 57 int L=heap[x].l,R=heap[x].r; 58 heap[L].f=L; heap[R].f=R; 59 heap[x].l=0; heap[x].r=0; heap[x].dis=0; 60 return Meg(L,R); 61 } 62 void Work(int ra,int rb){ 63 heap[ra].v/=2; heap[rb].v/=2; 64 int ra_=Del(ra),rb_=Del(rb); 65 int a=Meg(ra_,ra),b=Meg(rb_,rb); 66 int ans=Meg(a,b); 67 printf("%d ",heap[ans].v); 68 } 69 int main(){ 70 while (~scanf("%d",&n)){ 71 for (int i=1;i<=n;i++) heap[i].v=read(),heap[i].l=heap[i].r=heap[i].dis=0,heap[i].f=i; 72 int q=read(); 73 while (q--){ 74 int a=read(),b=read(); 75 int fa_=getf(a),fb_=getf(b); 76 if (fa_!=fb_){ 77 Work(fa_,fb_); 78 } else puts("-1"); 79 } 80 } 81 return 0; 82 }