题目传送门
代码：
/* 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; }
