2025-09-12 14:50:25 -03:00

147 lines
3.0 KiB
C++

/* Problem URL: https://codeforces.com/problemset/problem/2125/D */
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template <class T, class comp = less<>>
using ordered_set = tree<T, null_type , comp , rb_tree_tag , tree_order_statistics_node_update>;
#define V vector
#define rmin(a, b) a = min(a, b)
#define rmax(a, b) a = max(a, b)
#define rep(i, lim) for (int i = 0; i < (lim); i++)
#define nrep(i, s, lim) for (int i = s; i < (lim); i++)
#define repv(i, v) for (auto &i : (v))
#define fillv(v) for (auto &itr_ : (v)) { cin >> itr_; }
#define sortv(v) sort(v.begin(), v.end())
#define all(v) (v).begin(), (v).end()
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vvvvi = vector<vvvi>;
using ll = long long;
using vl = vector<ll>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;
using vvvvl = vector<vvvl>;
template<class v>
auto operator<<(ostream &os, const vector<v> &vec)->ostream& {
os << vec[0];
for (size_t i = 1; i < vec.size(); i++) {
os << ' ' << vec[i];
}
os << '\n';
return os;
}
template<class v>
auto operator>>(istream &is, vector<v> &vec)->istream& {
for (auto &i : vec) {
is >> i;
}
return is;
}
template<class v>
auto operator<<(ostream &os, const vector<vector<v>> &vec)->ostream& {
for (auto &i : vec) {
os << i[0];
for (size_t j = 1; j < i.size(); j++) {
os << ' ' << i[j];
}
os << '\n';
}
return os;
}
template<class v>
auto operator>>(istream &is, vector<vector<v>> &vec)->istream& {
for (auto &i : vec) {
for (auto &j : i) {
is >> j;
}
}
return is;
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, m;
cin >> n >> m;
ll mod = 998244353;
auto fastpow = [&](ll a, ll p) {
ll ans = 1;
ll now = a;
rep(i, 30) {
if ((p >> i) & 1) {
ans *= now;
ans %= mod;
}
now *= now;
now %= mod;
}
return ans;
};
if (m > 1) {
m = 1 << (32 - __builtin_clz(m - 1));
}
vl lazy(m * 2);
V<pair<ll, ll>> seg(m * 2);
auto propagate = [&](int i) {
if (lazy[i] == 0) {
return;
}
ll npos = ((1 - lazy[i]) % mod + mod) % mod;
seg[i].first = ((seg[i].first + lazy[i] - seg[i].first * lazy[i]) % mod + mod) % mod;
seg[i].second = (seg[i].second * npos) % mod;
if (i >= m) {
return;
}
};
function<void(int, int, int, int, int, ll)> update = [&](int i, int l, int r, int tl, int tr, ll v) {
propagate(i);
if (l > tr || r < tl) {
return;
}
if (l >= tl && r <= tr) {
lazy[i] = v;
return;
}
int mid = (l + r) >> 1;
update(i * 2, l, mid, tl, tr, v);
update(i * 2 + 1, mid + 1, r, tl, tr, v);
};
while (n--) {
}
}