題目傳送門

代碼：

/*
code by: zstu wxk
time: 2019/03/01
*/
#include<bits/stdc++.h>
using namespace std;
#define Fopen freopen("testdata.in","r",stdin); freopen("_out.txt","w",stdout);
#define LL long long
#define ULL unsigned LL
#define fi first
#define se second
#define pb push_back
#define
 
 lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define lch(x) tr[x].son[0]
#define rch(x) tr[x].son[1]
#define max3(a,b,c) max(a,max(b,c))
#define min3(a,b,c) min(a,min(b,c))
typedef pair<int,int> pll;
const int inf = 0x3f3f3f3f;
const int _inf = 0xc0c0c0c0;
const LL INF = 0x3f3f3f3f3f3f3f3f
 
;
const LL _INF = 0xc0c0c0c0c0c0c0c0;
const LL mod =  (int)1e9+7;
const int N = 1e5 + 100;

struct Node{
    int son[2], rt;
    int val, pos, dis;
    Node(){
        son[0] = son[1] = rt = 0;
        dis = 0;
    }
}tr[N];
bool cmp(Node & t1, Node &t2){
    if(t1.val == t2.val) return t1.pos < t2.pos;
    
 
return t1.val < t2.val;
}
int n, m;
int Find(int x){
    if(x == tr[x].rt) return x;
    return tr[x].rt = Find(tr[x].rt);
}
int Merge(int u, int v){
    if(u == v) return u;
    if(!u || !v) return u+v;
    if(!cmp(tr[u], tr[v])) swap(u, v);
    tr[u].son[1] = Merge(tr[u].son[1], v);
    tr[ tr[u].son[1] ].rt = u;
    if(tr[tr[u].son[0]].dis < tr[tr[u].son[1]].dis) swap(tr[u].son[1], tr[u].son[0]);
    tr[u].dis = tr[tr[u].son[1]].dis + 1;
    return u;
}
int Pop(int u){
    if(!u || tr[u].pos == -1) return -1;
    tr[ tr[u].son[0] ].rt = tr[u].son[0];
    tr[ tr[u].son[1] ].rt = tr[u].son[1];
    tr[u].rt = Merge(tr[u].son[0], tr[u].son[1]);
    tr[u].pos = -1;
    return tr[u].val;
}
void Ac(){
    tr[0].dis = -1;
    for(int i = 1; i <= n; ++i){
        scanf("%d", &tr[i].val);
        tr[i].pos = i;
        tr[i].rt = i;
    }
    int op, u, v;
    for(int i = 1; i <= m; ++i){
        scanf("%d", &op);
        if(op == 1){
            scanf("%d%d", &u, &v);
            if(tr[u].pos == -1 || tr[v].pos == -1) continue;
            u = Find(u), v = Find(v);
            if(u == v) continue;
            Merge(u, v);
        }
        else {
            scanf("%d", &u);
            if(tr[u].pos == -1){
                puts("-1");
                continue;
            }
            printf("%d\n", Pop(Find(u)));
        }
    }
}
int main(){
    while(~scanf("%d%d", &n, &m)){
        Ac();
    }
    return 0;
}

左偏樹 P3377【模板】左偏樹（可並堆）