P3377 【模板】左偏树（可并堆）

//#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast,no-stack-protector")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define pi acos(-1.0)
#define ll long long
#define vi vector<int>
#define mod 1000000007
#define C 0.5772156649
#define ls l,m,rt<<1
#define rs m+1,r,rt<<1|1
#define pil pair<int,ll>
#define pli pair<ll,int>
#define pii pair<int,int>
#define cd complex<double>
#define ull unsigned long long
#define base 1000000000000000000
#define fio ios::sync_with_stdio(false);cin.tie(0)

using namespace std;

const double g=10.0,eps=1e-12;
const int N=100000+10,maxn=1000+10,inf=0x3f3f3f3f,INF=0x3f3f3f3f3f3f3f3f;

int val[N],dis[N],f[N],ch[N][2];
int Merge(int x,int y)
{
    if(x==0||y==0)return x+y;
    if(val[x] > val[y] ||val[x]==val[y] && x>y)swap(x,y);
    ch[x][1] = Merge(ch[x][1],y);
    f[ch[x][1]] = x;
    if(dis[ch[x][0]] < dis[ch[x][1]])swap(ch[x][0],ch[x][1]);
    dis[x] = dis[ch[x][1]]+1;
    return x;
}
int getf(int x)
{
    while(f[x])x=f[x];
    return x;
}
void pop(int x)
{
    val[x]=-1;
    f[ch[x][0]]=f[ch[x][1]]=0;
    Merge(ch[x][0],ch[x][1]);
}
int main()
{
    int n,m;
    scanf("%d%d",&n,&m);
    dis[0]=-1;
    for(int i=1;i<=n;i++)
        scanf("%d",&val[i]);
    while(m--)
    {
        int op,x,y;
        scanf("%d%d",&op,&x);
        if(op==1)
        {
            scanf("%d",&y);
            if(val[x]==-1||val[y]==-1||getf(x)==getf(y))continue;
            Merge(getf(x),getf(y));
        }
        else
        {
            if(val[x]==-1)puts("-1");
            else
            {
                int p=getf(x);
                printf("%d
",val[p]);
                pop(p);
            }
        }
    }
    return 0;
}
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