QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#347606 | #8339. Rooted Tree | ucup-team2112# | AC ✓ | 1052ms | 4096kb | C++17 | 4.7kb | 2024-03-09 14:30:14 | 2024-03-09 14:30:15 |
Judging History
answer
#include "bits/stdc++.h"
#define rep(i, a, n) for (auto i = a; i <= (n); ++i)
#define revrep(i, a, n) for (auto i = n; i >= (a); --i)
#define all(a) a.begin(), a.end()
#define sz(a) (int)(a).size()
template<class T> inline bool chmax(T &a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T &a, T b) { if (b < a) { a = b; return 1; } return 0; }
using namespace std;
template<class A, class B> string to_string(const pair<A, B> &p);
template<class A, class B, class C> string to_string(const tuple<A, B, C> &p);
template<class A, class B, class C, class D> string to_string(const tuple<A, B, C, D> &p);
string to_string(const string &s) { return '"' + s + '"'; }
string to_string(const char *s) { return to_string((string) s); }
string to_string(char c) { return "'" + string(1, c) + "'"; }
string to_string(bool x) { return x ? "true" : "false"; }
template<size_t L> string to_string(const bitset<L> &x) { return x.to_string(); }
template<class A, class T = typename A::value_type> string to_string(const A &v) {
bool first = 1;
string res = "{";
for (const auto &x: v) {
if (!first) res += ", ";
first = 0;
res += to_string(x);
}
res += "}";
return res;
}
template<class A, class B> string to_string(const pair<A, B> &p) {
return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}
template<class A, class B, class C> string to_string(const tuple<A, B, C> &p) {
return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ")";
}
template<class A, class B, class C, class D> string to_string(const tuple<A, B, C, D> &p) {
return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ", " + to_string(get<3>(p)) + ")";
}
void debug_out() { cerr << endl; }
template<class H, class... T> void debug_out(const H& h, const T&... t) {
cerr << " " << to_string(h);
debug_out(t...);
}
#ifndef ONLINE_JUDGE
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) if (0) puts("No effect.")
#endif
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vvi = vector<vi>;
/**
* Author: Yuhao Yao
* Date: 23-05-11
* Description: Modular integer with $mod \le 2^{31} - 1$. Note that there are several advantages to use this code:
1. You do not need to keep writing $\%\, mod$;
2. It is good to use this struct when doing Gaussian Elimination / Fast Walsh-Hadamard Transform;
3. Sometimes the input number is greater than $mod$ and this code handles it.
Do not write things like $mint\{1 / 3\}.pow(10)$ since $1 / 3$ simply equals $0$.
Do not write things like $mint\{a * b\}$ where $a$ and $b$ are int since you might first have integer overflow.
* Usage: Define the followings globally:
const int mod = 998244353;
using mint = MInt<mod>;
* Status: tested on https://ac.nowcoder.com/acm/contest/33191/F.
*/
template<const unsigned &mod>
struct MInt {
using Z = MInt;
unsigned x; /// start-hash
MInt(ll a = 0): x(a % mod + mod) { if (x >= mod) x -= mod; }
explicit operator int() const { return x; }
Z& operator +=(Z b) { x += b.x; if (x >= mod) x -= mod; return *this; }
Z& operator -=(Z b) { x += mod - b.x; if (x >= mod) x -= mod; return *this; }
Z& operator *=(Z b) { x = 1ll * x * b.x % mod; return *this; }
friend Z operator +(Z a, Z b) { return a += b; }
friend Z operator -(Z a, Z b) { return a -= b; }
friend Z operator -(Z a) { return Z{} - a; }
friend Z operator *(Z a, Z b) { return a *= b; }
/// end-hash
// the followings are for ntt and polynomials.
Z pow(ll k) const { /// start-hash
Z res = 1, a = *this;
for (; k; k >>= 1, a = a * a) if (k & 1) res = res * a;
return res;
}
Z& operator /=(Z b) {
assert(b.x != 0);
return *this *= b.pow(mod - 2);
}
friend Z operator /(Z a, Z b) { return a /= b; }
friend bool operator ==(Z a, Z b) { return a.x == b.x; }
friend bool operator !=(Z a, Z b) { return a.x != b.x; }
friend bool operator <(Z a, Z b) { return a.x < b.x; }
static unsigned get_mod() { return mod; } // ntt need this.
/// end-hash
friend istream& operator >>(istream &is, Z &a) {
ll v; is >> v;
a = v;
return is;
}
friend string to_string(Z a) { return to_string(a.x); }
};
int main() {
ios::sync_with_stdio(0); cin.tie(0);
static const unsigned mod = 1e9 + 9;
using mint = MInt<mod>;
int m, k; cin >> m >> k;
mint ans = 0;
mint sum = 1, cnt = 1;
rep(i, 1, k) {
mint x = sum / cnt;
ans += x * m;
// x -> (x + 1) * m - x;
// sum x / cnt -> sum (x * (m - 1)) / cnt + m;
sum = sum + x * (m - 1) + m;
cnt = cnt + m - 1;
}
printf("%d\n", (int) ans);
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3684kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 4012kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 65ms
memory: 3828kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 708ms
memory: 3728kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3984kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 769ms
memory: 3748kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 435ms
memory: 3764kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1041ms
memory: 3764kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 190ms
memory: 3760kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 566ms
memory: 3792kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 338ms
memory: 4096kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 304ms
memory: 3744kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 901ms
memory: 3728kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1052ms
memory: 3792kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1046ms
memory: 3792kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1049ms
memory: 3740kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed