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121 lines
2.3 KiB
C++
121 lines
2.3 KiB
C++
#include <iostream>
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#include <cstdlib>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 1e5;
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int n, min, k, c, ans;
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char op;
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// Treap
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int root, cnt;
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struct node {
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int l, r, s, v, k;
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node()
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: l(0),
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r(0),
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s(0),
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v(0),
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k(rand()) {}
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node(int _v)
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: l(0),
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r(0),
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s(1),
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v(_v),
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k(rand()) {}
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} tr[N];
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void pushup(int u) {
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tr[u].s = tr[tr[u].l].s + 1 + tr[tr[u].r].s;
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}
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std::pair<int, int> split(int p, int k) {
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if (!p) return std::make_pair(0, 0);
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if (k <= tr[tr[p].l].s) {
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auto o = split(tr[p].l, k);
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tr[p].l = o.second;
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pushup(p);
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o.second = p;
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return o;
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}
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auto o = split(tr[p].r, k - tr[tr[p].l].s - 1);
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tr[p].r = o.first;
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pushup(p);
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o.first = p;
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return o;
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}
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std::pair<int, int> splitByValue(int p, int v) {
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if (!p) return std::make_pair(0, 0);
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if (v <= tr[p].v) {
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auto o = splitByValue(tr[p].l, v);
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tr[p].l = o.second;
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pushup(p);
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o.second = p;
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return o;
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}
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auto o = splitByValue(tr[p].r, v);
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tr[p].r = o.first;
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pushup(p);
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o.first = p;
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return o;
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}
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int merge(int x, int y) {
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if (!x || !y) return x | y;
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if (tr[x].k > tr[y].k) {
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tr[x].r = merge(tr[x].r, y);
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pushup(x);
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return x;
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}
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tr[y].l = merge(x, tr[y].l);
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pushup(y);
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return y;
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}
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void insert(int v) {
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auto o = splitByValue(root, v);
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int p = ++cnt;
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tr[p] = node(v);
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root = merge(o.first, merge(p, o.second));
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}
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int getKth(int k) {
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auto x = split(root, k - 1);
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auto y = split(x.second, 1);
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int r = y.first;
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root = merge(x.first, merge(y.first, y.second));
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return tr[r].v;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> n >> min;
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while (n--) {
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cin >> op >> k;
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if (op == 'I') {
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if (k >= min) {
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insert(k - c);
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}
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} else if (op == 'A') {
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c += k;
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} else if (op == 'S') {
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c -= k;
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auto o = splitByValue(root, min - c);
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root = o.second;
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ans += tr[o.first].s;
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} else { // op == 'F'
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cout << (tr[root].s < k ? -1 : getKth(tr[root].s - k + 1) + c) << endl;
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}
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}
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cout << ans << endl;
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return 0;
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}
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