QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#777947#8339. Rooted TreeZeoy#AC ✓1104ms3680kbC++201.2kb2024-11-24 11:33:462024-11-24 11:33:47

Judging History

This is the latest submission verdict.

  • [2024-11-24 11:33:47]
  • Judged
  • Verdict: AC
  • Time: 1104ms
  • Memory: 3680kb
  • [2024-11-24 11:33:46]
  • Submitted

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;
}
inline ll inv(int x) {
    return ksm(x, mod - 2);
}
inline ll frac(int x, int y) { // x / y (mod)
    return 1ll * x * inv(y) % mod;
}

int m, k;
void solve() {
    cin >> m >> k;
    int all = 0, cnt = 1;
    int res = 0, ans = 0;
    for(int i = 1; i <= k; i++) {
        int v = frac(all, cnt);
        res = sub(all, v);
        ans = add(v, ans);
        all = add(res , mul((v + 1), m));
        cnt += m - 1;
    }
    cout << add(all, 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: 1ms
memory: 3636kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

score: 0
Accepted
time: 1ms
memory: 3628kb

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 68ms
memory: 3600kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: 0
Accepted
time: 745ms
memory: 3576kb

input:

48 6713156

output:

198541581

result:

ok 1 number(s): "198541581"

Test #5:

score: 0
Accepted
time: 0ms
memory: 3544kb

input:

1 111

output:

6216

result:

ok 1 number(s): "6216"

Test #6:

score: 0
Accepted
time: 809ms
memory: 3672kb

input:

28 7304152

output:

457266679

result:

ok 1 number(s): "457266679"

Test #7:

score: 0
Accepted
time: 454ms
memory: 3576kb

input:

38 4101162

output:

232117382

result:

ok 1 number(s): "232117382"

Test #8:

score: 0
Accepted
time: 1096ms
memory: 3604kb

input:

51 9921154

output:

340670552

result:

ok 1 number(s): "340670552"

Test #9:

score: 0
Accepted
time: 202ms
memory: 3620kb

input:

79 1801157

output:

620550406

result:

ok 1 number(s): "620550406"

Test #10:

score: 0
Accepted
time: 603ms
memory: 3680kb

input:

22 5417157

output:

457449071

result:

ok 1 number(s): "457449071"

Test #11:

score: 0
Accepted
time: 356ms
memory: 3536kb

input:

25 3210162

output:

36368303

result:

ok 1 number(s): "36368303"

Test #12:

score: 0
Accepted
time: 323ms
memory: 3584kb

input:

67 2919160

output:

935195555

result:

ok 1 number(s): "935195555"

Test #13:

score: 0
Accepted
time: 948ms
memory: 3572kb

input:

77 8613163

output:

482832472

result:

ok 1 number(s): "482832472"

Test #14:

score: 0
Accepted
time: 1104ms
memory: 3580kb

input:

90 10000000

output:

275581651

result:

ok 1 number(s): "275581651"

Test #15:

score: 0
Accepted
time: 1103ms
memory: 3632kb

input:

99 9999999

output:

126087169

result:

ok 1 number(s): "126087169"

Test #16:

score: 0
Accepted
time: 1099ms
memory: 3588kb

input:

100 10000000

output:

451590067

result:

ok 1 number(s): "451590067"

Extra Test:

score: 0
Extra Test Passed