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| #include <cstdio>
#include <algorithm>
using namespace std;
const int N = 1e5 + 10;
int n, m, p[N];
struct Node
{
bool vis;
int id, v, d, ls, rs;
bool operator>(Node &x) const
{
return v > x.v || (v == x.v && id > x.id);
}
} tr[N];
int fa(int x)
{
return x == p[x] ? x : p[x] = fa(p[x]);
}
int merge(int x, int y)
{
if (!x || !y)
return x | y;
if (tr[x] > tr[y])
swap(x, y);
tr[x].rs = merge(tr[x].rs, y);
if (tr[tr[x].rs].d > tr[tr[x].ls].d)
swap(tr[x].ls, tr[x].rs);
tr[x].d = tr[tr[x].rs].d + 1;
return x;
}
void remove(int x)
{
tr[x].vis = true;
p[tr[x].ls] = p[tr[x].rs] = p[x] = merge(tr[x].ls, tr[x].rs);
tr[x].ls = tr[x].rs = tr[x].d = 0;
}
int main()
{
scanf("%d%d", &n, &m);
for (int i = 1; i <= n; i++)
{
scanf("%d", &tr[i].v);
p[i] = tr[i].id = i;
}
for (int op; m; m--)
{
scanf("%d", &op);
if (op == 1)
{
int x, y;
scanf("%d%d", &x, &y);
if (tr[x].vis || tr[x].vis)
continue;
x = fa(x);
y = fa(y);
if (x != y)
p[x] = p[y] = merge(x, y);
}
if (op == 2)
{
int x;
scanf("%d", &x);
if (tr[x].vis)
{
puts("-1");
continue;
}
x = fa(x);
printf("%d\n", tr[x].v);
remove(x);
}
}
return 0;
}
|