傳送門

寫一個大根堆就可以了 , 注意並查集找fa不能路徑壓縮 , 因為每個點所在的集合的根是變化的

#include<bits/stdc++.h>
#define N 1000050
using namespace std;
struct Node{int l,r;}t[N];
int n,m,a[N],fa[N],killed[N]; char s[10];
int read(){
	int cnt=0;char ch=0;
	while(!isdigit(ch))ch=getchar();
	while(isdigit(ch))cnt=cnt*10+(ch-'0'),ch=getchar();
	return cnt; 
} 
int find(int x){return x==fa[x]?x:find(fa[x]);}
int Merge(int x,int y){
	if(!x || !y) return x+y;
	if(a[x] > a[y]) swap(x,y);
	t[x].l = Merge(t[x].l , y); 
	fa[t[x].l] = x;
	if(rand()%2) swap(t[x].l , t[x].r);
	return x;
}
void Delete(int x){
	killed[x]=1;
	fa[t[x].l] = t[x].l;
	fa[t[x].r] = t[x].r;
	Merge(t[x].l , t[x].r);
}
void Kill(int x){
	if(killed[x]){printf("0\n"); return;}
	x=find(x); printf("%d\n",a[x]); Delete(x);
}
int main(){
	srand(time(0));
	n=read();
	for(int i=1;i<=n;i++) a[i]=read() , fa[i]=i;
	m=read(); while(m--){
		scanf("%s",s); 
		if(s[0]=='K') Kill(read());
		if(s[0]=='M'){
			int x=read(),y=read(); 
			if(killed[x] || killed[y]) continue;
			x=find(x),y=find(y);
			if(x != y) Merge(x,y);
		}
	}return 0;
}