QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#353045 | #8339. Rooted Tree | Djangle162857# | AC ✓ | 1133ms | 3680kb | C++20 | 1.2kb | 2024-03-13 20:10:57 | 2024-03-13 20:10:58 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
#define debug(x) cerr << #x << " == " << x << endl
#define el '\n'
typedef long long ll;
const ll mod = 1000000009;
const ll inf = 2147483647;
const int N = 1e7 + 10;
ll fac[N], ifac[N];
ll qpow(ll a, ll b)
{
ll ret = 1;
while (b) {
if (b & 1)
ret = ret * a % mod;
a = a * a % mod;
b >>= 1;
}
return ret;
}
void init()
{
fac[0] = 1;
for (int i = 1; i < N; i++)
fac[i] = fac[i - 1] * i % mod;
ifac[N - 1] = qpow(fac[N - 1], mod - 2);
for (int i = N - 1; i; i--) {
ifac[i - 1] = ifac[i] * i % mod;
}
}
ll up(ll x)
{
return (x % mod + mod) % mod;
}
ll inv(ll x)
{
return qpow(x, mod - 2);
}
void solve()
{
int m, k;
cin >> m >> k;
ll e = 0, lase = 0, ans = 0, lasans = 0;
ll tot = 1;
for (int i = 1; i <= k; i++) {
lasans = ans;
ans = lasans + m * (e + 1);
ans = up(ans);
lase = e;
e = up(lase * tot - lase + (lase + 1) * m);
tot += m - 1;
e = up(e);
e = e * inv(tot);
e = up(e);
// cout << i << " " << ans << endl;
}
cout << ans << endl;
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
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: 1ms
memory: 3660kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3680kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 70ms
memory: 3568kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 756ms
memory: 3608kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3604kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 825ms
memory: 3624kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 459ms
memory: 3660kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1123ms
memory: 3608kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 204ms
memory: 3556kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 608ms
memory: 3564kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 364ms
memory: 3632kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 326ms
memory: 3568kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 965ms
memory: 3620kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1133ms
memory: 3656kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1129ms
memory: 3568kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1129ms
memory: 3560kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed