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| #include <iostream>
#include <cstdio>
#include <climits>
#define inf INT_MAX
using namespace std;
const int N = 1e5 + 10;
int n, m, rt, idx, delta;
struct Node
{
int s[2], p, v, sz;
void init(int a, int b)
{
v = a;
p = b;
sz = 1;
}
}tr[N];
void pushup(int x)
{
tr[x].sz = tr[tr[x].s[0]].sz + tr[tr[x].s[1]].sz + 1;
}
void rotate(int x)
{
int y = tr[x].p, z = tr[y].p;
int k = tr[y].s[1] == x;
tr[z].s[tr[z].s[1] == y] = x;
tr[x].p = z;
tr[y].s[k] = tr[x].s[k ^ 1];
tr[tr[x].s[k ^ 1]].p = y;
tr[x].s[k ^ 1] = y;
tr[y].p = x;
pushup(y);
pushup(x);
}
void splay(int x, int k)
{
while (tr[x].p != k)
{
int y = tr[x].p, z = tr[y].p;
if (z != k)
if ((tr[y].s[1] == x) ^ (tr[z].s[1] == y))
rotate(x);
else
rotate(y);
rotate(x);
}
if (!k)
rt = x;
}
int insert(int v)
{
int u = rt, p = 0;
while (u)
{
p = u;
u = tr[u].s[v > tr[u].v];
}
u = ++idx;
if (p)
tr[p].s[v > tr[p].v] = u;
tr[u].init(v, p);
splay(u, 0);
return u;
}
int get(int v)
{
int u = rt, res;
while (u)
{
if (tr[u].v >= v)
{
res = u;
u = tr[u].s[0];
}
else
u = tr[u].s[1];
}
return res;
}
int get_k(int k)
{
int u = rt;
while (true)
{
if (tr[tr[u].s[0]].sz >= k)
u = tr[u].s[0];
else if (tr[tr[u].s[0]].sz + 1 == k)
return tr[u].v;
else
{
k -= tr[tr[u].s[0]].sz + 1;
u = tr[u].s[1];
}
}
return -1;
}
int main()
{
cin >> n >> m;
int L = insert(-inf), R = insert(inf);
int tot = 0;
while (n--)
{
char op[2];
int k;
cin >> op >> k;
if (op[0] == 'I')
{
if (k >= m)
{
insert(k - delta);
tot++;
}
}
else if (op[0] == 'A')
delta += k;
else if (op[0] == 'S')
{
delta -= k;
R = get(m - delta);
splay(R, 0);
splay(L, R);
tr[L].s[1] = 0;
pushup(L);
pushup(R);
}
else
{
if (tr[rt].sz - 2 < k)
cout << -1 << endl;
else
{
int t = get_k(tr[rt].sz - k);
if (~t)
cout << t + delta << endl;
else
cout << -1 << endl;
}
}
}
cout << tot - (tr[rt].sz - 2);
return 0;
}
|