QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#667596 | #8339. Rooted Tree | tilenn | AC ✓ | 1477ms | 42272kb | C++14 | 2.7kb | 2024-10-23 00:28:45 | 2024-10-23 00:28:45 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#define endl '\n'
typedef long long LL;
template<class T>
T qmi(T a,LL k){
T res = 1;
while(k){
if(k & 1)res *= a;
a *= a;
k >>= 1;
}
return res;
}
struct MInt{
int v;
const static int Mod;
MInt() : v() {}
MInt(LL _v) : v(norm(_v % Mod)) {}
static int getMod(){
return Mod;
}
int norm(int x) const {
if(x < 0){
x += Mod;
}else if(x >= Mod){
x -= Mod;
}
return x;
}
int val() const {return v;}
MInt operator-() const {
MInt res;
res.v = norm(Mod - v);
return res;
}
MInt inv() const {
return qmi(*this,Mod - 2);
}
MInt &operator*=(MInt rhs) & {
v = 1LL * v * rhs.v % Mod;
return *this;
}
MInt &operator+=(MInt rhs) & {
v = norm(v + rhs.v);
return *this;
}
MInt &operator-=(MInt rhs) & {
v = norm(v - rhs.v);
return *this;
}
MInt &operator/=(MInt rhs) & {
return *this *= rhs.inv();
}
friend MInt operator*(MInt lhs, MInt rhs) {
return 1LL * lhs.val() * rhs.val();
}
friend MInt operator+(MInt lhs, MInt rhs) {
return lhs.val() + rhs.val();
}
friend MInt operator-(MInt lhs, MInt rhs) {
return lhs.val() - rhs.val();
}
friend MInt operator/(MInt lhs, MInt rhs) {
return 1LL * lhs.val() * rhs.inv().val();
}
friend std::istream &operator>>(std::istream &is, MInt &a) {
LL v;
is >> v;
a = MInt(v);
return is;
}
friend std::ostream &operator<<(std::ostream &os, const MInt &a) {
return os << a.val();
}
friend bool operator<(MInt lhs,MInt rhs) {
return lhs.val() < rhs.val();
}
friend bool operator==(MInt lhs, MInt rhs) {
return lhs.val() == rhs.val();
}
friend bool operator!=(MInt lhs, MInt rhs) {
return lhs.val() != rhs.val();
}
};
const int MInt::Mod = 1e9 + 9;
using Z = MInt;
void solve(){
int m,k;
cin >> m >> k;
vector<Z> dp(k + 1);
Z res = 0;
for(int i = 1;i <= k;i++){
Z inv = (Z(1) + (i - 1) * (m - 1)).inv();
res += dp[i - 1] * inv;
dp[i] = dp[i - 1] - (dp[i - 1] * inv) + (dp[i - 1] * inv + 1) * m;
}
res += dp[k];
cout << res << endl;
//1,m,2m - 1,3m - 2,4m - 3... km + k - 1
}
int main(){
ios::sync_with_stdio(false);
cin.tie(NULL),cout.tie(NULL);
int t = 1;
//cin >> t;
while(t--){
solve();
}
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3484kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3512kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 92ms
memory: 5556kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 990ms
memory: 29500kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3528kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 1074ms
memory: 31736kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 604ms
memory: 19208kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1462ms
memory: 41936kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 268ms
memory: 10028kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 798ms
memory: 24268kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 472ms
memory: 15696kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 429ms
memory: 14580kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 1273ms
memory: 36604kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1477ms
memory: 42208kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1473ms
memory: 42192kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1477ms
memory: 42272kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed