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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#779923#8339. Rooted TreeZeoyAC ✓1160ms120892kbC++201.4kb2024-11-24 22:48:572024-11-24 22:48:59

Judging History

你现在查看的是最新测评结果

  • [2024-11-24 22:48:59]
  • 评测
  • 测评结果:AC
  • 用时:1160ms
  • 内存:120892kb
  • [2024-11-24 22:48:57]
  • 提交

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

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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