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QOJ

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
#347988#8339. Rooted Treeucup-team1600#AC ✓1390ms3672kbC++202.4kb2024-03-09 16:31:242024-03-09 16:31:27

Judging History

你现在查看的是最新测评结果

  • [2024-03-09 16:31:27]
  • 评测
  • 测评结果:AC
  • 用时:1390ms
  • 内存:3672kb
  • [2024-03-09 16:31:24]
  • 提交

answer

//#pragma GCC optimize("Ofast", "unroll-loops")
//#pragma GCC target("sse", "sse2", "sse3", "ssse3", "sse4")

#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
#include <set>
#include <stack>
#include <map>
#include <unordered_map>
#include <iomanip>
#include <cmath>
#include <queue>
#include <bitset>
#include <numeric>
#include <array>
#include <cstring>
#include <random>
#include <chrono>
#include <cassert>

#define all(a) a.begin(),a.end()
#define len(a) (int)(a.size())
#define mp make_pair
#define pb push_back
#define fir first
#define sec second
#define fi first
#define se second

using namespace std;

typedef pair<int, int> pii;
typedef long long ll;
typedef long double ld;

template<typename T>
bool umin(T &a, T b) {
    if (b < a) {
        a = b;
        return true;
    }
    return false;
}

template<typename T>
bool umax(T &a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

#ifdef KIVI
#define DEBUG for (bool _FLAG = true; _FLAG; _FLAG = false)
#define LOG(...) print(#__VA_ARGS__" ::", __VA_ARGS__) << endl

template<class ...Ts>
auto &print(Ts ...ts) { return ((cerr << ts << " "), ...); }

#else
#define DEBUG while (false)
#define LOG(...)
#endif

mt19937 rng(4242);

const int max_n = -1, inf = 1000111222;

const int mod = 1000000009;

int mul(int a, int b) {
    return (a * 1ll * b) % mod;
}

int binpow(int a, int b) {
    int res = 1;
    while(b) {
        if(b % 2) res = mul(res, a);
        a = mul(a, a);
        b /= 2;
    }
    return res;
}

int inv(int x) {
    return binpow(x, mod - 2);
}

int divide(int a, int b) {
    return mul(a, inv(b));
}

int add(int a, int b) {
    if(b < 0) b += mod;
    int res = (a + b);
    if(res >= mod) res -= mod;
    return res;
}

void solve() {
    int m, k;
    cin >> m >> k;
    int am = 1, sum = 0, ans = 0;
    for(int i = 1; i <= k; i++) {
        int cur = divide(sum, am);
        ans = add(ans, mul((cur + 1), m));
        am = add(am, m - 1);
        sum = add(sum,-cur);
        sum = add(sum, mul((cur + 1), m));
    }
    cout << ans << '\n';
}

int main() {
//    freopen("input.txt", "r", stdin);
//    freopen("output.txt", "w", stdout);

    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int t = 1;

//    cin >> t;

    while (t--) solve();

}

/*
KIVI
*/

详细

Test #1:

score: 100
Accepted
time: 0ms
memory: 3672kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3596kb

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 86ms
memory: 3612kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: 0
Accepted
time: 933ms
memory: 3608kb

input:

48 6713156

output:

198541581

result:

ok 1 number(s): "198541581"

Test #5:

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

input:

1 111

output:

6216

result:

ok 1 number(s): "6216"

Test #6:

score: 0
Accepted
time: 1015ms
memory: 3528kb

input:

28 7304152

output:

457266679

result:

ok 1 number(s): "457266679"

Test #7:

score: 0
Accepted
time: 566ms
memory: 3584kb

input:

38 4101162

output:

232117382

result:

ok 1 number(s): "232117382"

Test #8:

score: 0
Accepted
time: 1378ms
memory: 3604kb

input:

51 9921154

output:

340670552

result:

ok 1 number(s): "340670552"

Test #9:

score: 0
Accepted
time: 251ms
memory: 3608kb

input:

79 1801157

output:

620550406

result:

ok 1 number(s): "620550406"

Test #10:

score: 0
Accepted
time: 753ms
memory: 3668kb

input:

22 5417157

output:

457449071

result:

ok 1 number(s): "457449071"

Test #11:

score: 0
Accepted
time: 446ms
memory: 3584kb

input:

25 3210162

output:

36368303

result:

ok 1 number(s): "36368303"

Test #12:

score: 0
Accepted
time: 406ms
memory: 3556kb

input:

67 2919160

output:

935195555

result:

ok 1 number(s): "935195555"

Test #13:

score: 0
Accepted
time: 1197ms
memory: 3632kb

input:

77 8613163

output:

482832472

result:

ok 1 number(s): "482832472"

Test #14:

score: 0
Accepted
time: 1390ms
memory: 3524kb

input:

90 10000000

output:

275581651

result:

ok 1 number(s): "275581651"

Test #15:

score: 0
Accepted
time: 1389ms
memory: 3532kb

input:

99 9999999

output:

126087169

result:

ok 1 number(s): "126087169"

Test #16:

score: 0
Accepted
time: 1390ms
memory: 3548kb

input:

100 10000000

output:

451590067

result:

ok 1 number(s): "451590067"

Extra Test:

score: 0
Extra Test Passed