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OI-codes/LibreOJ/10127/10127.cpp

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#include <bits/stdc++.h>
using namespace std;
struct node {
int l, r, v;
node() {
l = r = 0;
v = -0x3f3f3f3f;
}
node(int _l, int _r) {
l = _l;
r = _r;
v = -0x3f3f3f3f;
}
} tr[200005 << 2];
int m, p;
char op;
void build(int u, int l, int r) {
tr[u] = node(l, r);
if (l == r) return;
int mid = l + r >> 1;
build(u << 1, l, mid);
build(u << 1 | 1, mid + 1, r);
}
void pushup(int u) {
tr[u].v = max(tr[u << 1].v, tr[u << 1 | 1].v);
}
int query(int u, int l, int r) {
if (tr[u].l >= l && tr[u].r <= r) return tr[u].v;
int mid = tr[u].l + tr[u].r >> 1;
int v = 0;
if (l <= mid) v = query(u << 1, l, r);
if (r > mid) v = max(v, query(u << 1 | 1, l, r));
return v;
}
void modify(int u, int x, int v) {
if (tr[u].l == x && tr[u].r == x) {
tr[u].v = v;
return;
}
int mid = tr[u].l + tr[u].r >> 1;
if (x <= mid) modify(u << 1, x, v);
else modify(u << 1 | 1, x, v);
pushup(u);
}
int main() {
cin >> m >> p;
int n = 0, x, a = 0;
build(1, 1, m);
while (m--) {
cin >> op >> x;
if (op == 'Q') {
a = query(1, n - x + 1, n);
cout << a << endl;
} else {
modify(1, ++n, (a + x) % p);
}
}
return 0;
}