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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
#348048#8339. Rooted Treeucup-team3113#AC ✓1390ms3680kbC++202.3kb2024-03-09 16:44:042024-03-09 16:44:06

Judging History

你现在查看的是最新测评结果

  • [2024-03-09 16:44:06]
  • 评测
  • 测评结果:AC
  • 用时:1390ms
  • 内存:3680kb
  • [2024-03-09 16:44:04]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;

#define TRACE(x) cerr << __LINE__ << ": " << #x << " = " << x << endl
#define _ << " _ " <<

template<class T, class U>
ostream& operator<<(ostream &o, pair<T, U> x) {
  return o << "(" << x.first << ", " << x.second << ")";
}
template<class> struct is_container : false_type {};
template<class... Ts> struct is_container<vector<Ts...>> : true_type {};
template<class... Ts> struct is_container<map<Ts...>> : true_type {};
template<class... Ts> struct is_container<unordered_map<Ts...>> : true_type {};
template<class... Ts> struct is_container<set<Ts...>> : true_type {};
template<class... Ts> struct is_container<unordered_set<Ts...>> : true_type {};
template<class... Ts> struct is_container<multiset<Ts...>> : true_type {};
template<class... Ts> struct is_container<unordered_multiset<Ts...>> : true_type {};
template<class T, class = typename enable_if<is_container<T>::value>::type>
ostream& operator<<(ostream &o, T x) {
  int f = 1;
  o << "{";
  for (auto y : x) {
    o << (f ? "" : ", ") << y;
    f = 0;
  }
  return o << "}";
}

#define fi first
#define se second
#define all(x) (x).begin(), (x).end()

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;

const int MOD = 1e9 + 9;
int add(int a, int b) { 
    a += b;
    if (a >= MOD) a -= MOD;
    return a;
}
int sub(int a, int b) { return add(a, MOD - b); }
int mul(int a, int b) { return (ll)a * b % MOD; }
int pwr(int a, int b) {
    int res = 1;
    for (; b; b >>= 1) {
        if (b & 1) res = mul(res, a);
        a = mul(a, a);
    }
    return res;
}
int inv(int a) { return pwr(a, MOD - 2); }

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int M, K;
    cin >> M >> K;

    int sum_leaves = 0, sum = 0, cnt_leaves = 1;
    for (int i = 0; i < K; i++) {
        int d = mul(sum_leaves, inv(cnt_leaves));
        sum = add(sum, mul(M, d + 1));
        sum_leaves = add(sum_leaves, sub(mul(M, d + 1), d));
        cnt_leaves += M - 1;
    }
    cout << sum << '\n';

    return 0;
}

// d -> doda M*(d+1)-d = (M-1)d + M na sumu dubina listova
//      doda M*(d+1) na sumu dubina svih
// nakon k imamo 1 + (M-1)k listova

详细

Test #1:

score: 100
Accepted
time: 1ms
memory: 3568kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

score: 0
Accepted
time: 1ms
memory: 3624kb

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 82ms
memory: 3680kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: 0
Accepted
time: 935ms
memory: 3652kb

input:

48 6713156

output:

198541581

result:

ok 1 number(s): "198541581"

Test #5:

score: 0
Accepted
time: 1ms
memory: 3612kb

input:

1 111

output:

6216

result:

ok 1 number(s): "6216"

Test #6:

score: 0
Accepted
time: 1013ms
memory: 3564kb

input:

28 7304152

output:

457266679

result:

ok 1 number(s): "457266679"

Test #7:

score: 0
Accepted
time: 571ms
memory: 3524kb

input:

38 4101162

output:

232117382

result:

ok 1 number(s): "232117382"

Test #8:

score: 0
Accepted
time: 1378ms
memory: 3636kb

input:

51 9921154

output:

340670552

result:

ok 1 number(s): "340670552"

Test #9:

score: 0
Accepted
time: 251ms
memory: 3680kb

input:

79 1801157

output:

620550406

result:

ok 1 number(s): "620550406"

Test #10:

score: 0
Accepted
time: 753ms
memory: 3620kb

input:

22 5417157

output:

457449071

result:

ok 1 number(s): "457449071"

Test #11:

score: 0
Accepted
time: 447ms
memory: 3568kb

input:

25 3210162

output:

36368303

result:

ok 1 number(s): "36368303"

Test #12:

score: 0
Accepted
time: 406ms
memory: 3672kb

input:

67 2919160

output:

935195555

result:

ok 1 number(s): "935195555"

Test #13:

score: 0
Accepted
time: 1192ms
memory: 3652kb

input:

77 8613163

output:

482832472

result:

ok 1 number(s): "482832472"

Test #14:

score: 0
Accepted
time: 1390ms
memory: 3648kb

input:

90 10000000

output:

275581651

result:

ok 1 number(s): "275581651"

Test #15:

score: 0
Accepted
time: 1389ms
memory: 3608kb

input:

99 9999999

output:

126087169

result:

ok 1 number(s): "126087169"

Test #16:

score: 0
Accepted
time: 1383ms
memory: 3556kb

input:

100 10000000

output:

451590067

result:

ok 1 number(s): "451590067"

Extra Test:

score: 0
Extra Test Passed