QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#779923 | #8339. Rooted Tree | Zeoy | AC ✓ | 1160ms | 120892kb | C++20 | 1.4kb | 2024-11-24 22:48:57 | 2024-11-24 22:48:59 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
#define endl "\n"
// #define int long long
using ll = long long;
const int mod = 1e9 + 9;
int add(int a, int b) {
int c = a + b;
if (c >= mod) c -= mod;
return c;
}
int sub(int a, int b) {
int c = a - b;
if (c < 0) c += mod;
return c;
}
int mul(int a, int b) {
ll c = 1ll * a * b;
if (c >= mod) c %= mod;
return c;
}
inline ll ksm(ll a, ll b) {
ll res = 1;
for (; b; b >>= 1) {
if (b & 1) {
res = res * a % mod;
}
a = a * a % mod;
}
return res;
}
const int N = 10000010;
int ans[N], f[N], cnt[N];
void solve() {
int M, K; cin >> M >> K;
int ANS = 0;
f[0] = 0;
cnt[0] = 1;
for (int i = 1; i <= K; ++i) {
cnt[i] = cnt[i - 1] + M - 1;
int inv = ksm(cnt[i - 1], mod - 2);
ans[i] = mul(M, add(mul(f[i - 1], inv), 1));
ANS = add(ANS, ans[i]);
f[i] = 0;
f[i] = add(f[i], ans[i]);
f[i] = add(f[i], f[i - 1]);
f[i] = sub(f[i], mul(f[i - 1], inv));
// cerr << "new = " << ans[i] << ", sum = " << f[i] << endl;
}
cout << ANS << endl;
}
signed main() {
ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
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: 7736kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 7636kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 64ms
memory: 15080kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 756ms
memory: 84944kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 1ms
memory: 7708kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 835ms
memory: 93612kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 478ms
memory: 52784kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1148ms
memory: 120524kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 208ms
memory: 33056kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 626ms
memory: 72008kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 368ms
memory: 45872kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 333ms
memory: 44952kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 988ms
memory: 107028kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1160ms
memory: 120812kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1137ms
memory: 120740kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1151ms
memory: 120892kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed