QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#666379#8339. Rooted Tree1234576AC ✓1103ms162928kbC++202.0kb2024-10-22 18:04:482024-10-22 18:04:54

Judging History

你现在查看的是最新测评结果

  • [2024-10-22 18:04:54]
  • 评测
  • 测评结果:AC
  • 用时:1103ms
  • 内存:162928kb
  • [2024-10-22 18:04:48]
  • 提交

answer

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

#define ll        long long
#define ull       unsigned long long
#define fir       first
#define sec       second
#define pii       pair<int, int>
#define pll       pair<long long, long long>
#define lowbit(a) (a & (-a))
#define SZ(a)     ((int)a.size())
#define all(a)    a.begin(), a.end()

constexpr int N = 2e7 + 50;
constexpr int INF = 0x3f3f3f3f;
constexpr ll LINF = 0x3f3f3f3f3f3f3f3f;
constexpr int mod = 1e9 + 9;
constexpr int dir[4][2] = {
    {-1,  0},
    { 0,  1},
    { 1,  0},
    { 0, -1},
};

mt19937_64 rnd(random_device{}());
uniform_int_distribution<ull> dist(0, ULLONG_MAX); // use dist(rnd)
const int M = 4e7 + 10; 

#define int long long


ll qpow(ll a, ll b)
{
	ll res = 1;
	while(b)
	{
		if(b & 1) res = res * a % mod;
		a = a * a % mod;
		b >>= 1;
	}
	return res;
}

ll f[N], g[N];
ll inv[N];
void solve() {
//	int base = 600000038;
//	for(int i = 1; i <= 1000; ++i)
//		cout << i << ' ' << i * base % mod << '\n'; 
	
	int m = 1, k = 10000000; 
	cin >> m >> k;
	g[0] = 1;
	for(int i = 1; i <= k; ++i) 
		g[i] = g[i - 1] + m - 1;
//	inv[1] = 1;
//	for(int i = 2; i <= 10000000; ++i)
//    {
//        inv[i] = (1ll * inv[mod % i] * (-mod / i) % mod + mod) % mod;
//    }
//	for(int i = 1; i <= k; ++i)
//	{
//		if(mod % g[i] >= 10000000) 
//		{
//			cout << "!!!\n";
//			return ;
//		}
//		g[i] = (1ll * inv[mod % g[i]] * (-mod / g[i]) % mod + mod) % mod;
//		
//	}
	ll Ans = 0;	
	f[0] = 0;
	ll pre = 1;
	for(int i = 1; i <= k; ++i)	
	{
		
		f[i] = ((1ll * (m - 1) * f[i - 1] % mod) * pre % mod + f[i - 1] + m) % mod; 
		pre = qpow(g[i], mod - 2);
		if(i < k) Ans = (Ans + f[i] * pre) % mod;
	}
	Ans += f[k];
	Ans %= mod;
	cout << Ans << '\n';
}
/*
4 1 3 1
1 2 3 100
9 1 9 1
2 4 5
*/

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int _ = 1;
//    cin >> _;
    while (_--)
        solve();
    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 1ms
memory: 7904kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

score: 0
Accepted
time: 1ms
memory: 7696kb

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 66ms
memory: 15828kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: 0
Accepted
time: 746ms
memory: 114128kb

input:

48 6713156

output:

198541581

result:

ok 1 number(s): "198541581"

Test #5:

score: 0
Accepted
time: 1ms
memory: 7692kb

input:

1 111

output:

6216

result:

ok 1 number(s): "6216"

Test #6:

score: 0
Accepted
time: 796ms
memory: 122264kb

input:

28 7304152

output:

457266679

result:

ok 1 number(s): "457266679"

Test #7:

score: 0
Accepted
time: 454ms
memory: 71180kb

input:

38 4101162

output:

232117382

result:

ok 1 number(s): "232117382"

Test #8:

score: 0
Accepted
time: 1087ms
memory: 162928kb

input:

51 9921154

output:

340670552

result:

ok 1 number(s): "340670552"

Test #9:

score: 0
Accepted
time: 200ms
memory: 36360kb

input:

79 1801157

output:

620550406

result:

ok 1 number(s): "620550406"

Test #10:

score: 0
Accepted
time: 599ms
memory: 91664kb

input:

22 5417157

output:

457449071

result:

ok 1 number(s): "457449071"

Test #11:

score: 0
Accepted
time: 354ms
memory: 58844kb

input:

25 3210162

output:

36368303

result:

ok 1 number(s): "36368303"

Test #12:

score: 0
Accepted
time: 326ms
memory: 52756kb

input:

67 2919160

output:

935195555

result:

ok 1 number(s): "935195555"

Test #13:

score: 0
Accepted
time: 941ms
memory: 141392kb

input:

77 8613163

output:

482832472

result:

ok 1 number(s): "482832472"

Test #14:

score: 0
Accepted
time: 1099ms
memory: 162320kb

input:

90 10000000

output:

275581651

result:

ok 1 number(s): "275581651"

Test #15:

score: 0
Accepted
time: 1103ms
memory: 162796kb

input:

99 9999999

output:

126087169

result:

ok 1 number(s): "126087169"

Test #16:

score: 0
Accepted
time: 1102ms
memory: 162412kb

input:

100 10000000

output:

451590067

result:

ok 1 number(s): "451590067"

Extra Test:

score: 0
Extra Test Passed