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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#683205#8339. Rooted Treeucup-team3519#AC ✓1101ms3688kbC++17878b2024-10-27 19:28:332024-10-27 19:28:34

Judging History

你现在查看的是最新测评结果

  • [2024-10-27 19:28:34]
  • 评测
  • 测评结果:AC
  • 用时:1101ms
  • 内存:3688kb
  • [2024-10-27 19:28:33]
  • 提交

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)
}

详细

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