QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#683205 | #8339. Rooted Tree | ucup-team3519# | AC ✓ | 1101ms | 3688kb | C++17 | 878b | 2024-10-27 19:28:33 | 2024-10-27 19:28:34 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#define V vector
#define pb push_back
typedef pair<int, int> pi;
typedef long long LL;
#define fi first
#define se second
const int mod = 1e9 + 9;
LL qpow(LL x, LL k) {
LL ans = 1;
while(k) {
if(k & 1) ans = ans * x % mod;
k /= 2;
x = x * x % mod;
}
return ans;
}
int main() {
int m, k; cin >> m >> k;
//-> hav = 1 + m * (i - 1);
//LL sum = ?
//LL new = sum / hav
//sum' = sum + new * m;
int hav = 1;
LL sum = 0;
LL ans = 0;
for(int i = 1; i <= k; i++) {
LL avg = (qpow(hav, mod - 2) * sum) % mod;
sum = (sum + avg * (m - 1) + m) % mod;
ans = (ans + (avg + 1) * m) % mod;
hav += m - 1;
}
cout << ans << endl;
//0 -> 111111(1 * 6)
//6 + (1 / 7) * (6) + (6 / 7) * (12)
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3688kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3588kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 68ms
memory: 3684kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 746ms
memory: 3480kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3488kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 801ms
memory: 3480kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 448ms
memory: 3588kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1084ms
memory: 3488kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 195ms
memory: 3528kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 597ms
memory: 3620kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 355ms
memory: 3520kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 318ms
memory: 3596kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 948ms
memory: 3592kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1101ms
memory: 3516kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1101ms
memory: 3616kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1097ms
memory: 3688kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed