답안 #916872

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
916872 2024-01-26T16:22:45 Z mickey080929 Asceticism (JOI18_asceticism) C++17
100 / 100
14 ms 6748 KB
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef pair<ll,ll> pll;

const ll mod = 1e9 + 7;

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

ll fac[400010];
ll inv[400010];

ll C(ll n, ll r) {
	if (n < r) return 0;
	return fac[n] * inv[r] % mod * inv[n-r] % mod;
}

int main() {
	ios_base :: sync_with_stdio(false); cin.tie(NULL);
	fac[0] = 1;
	for (ll i=1; i<=400000; i++) {
		fac[i] = fac[i-1] * i % mod;
	}
	inv[400000] = modpow(fac[400000], mod-2);
	for (ll i=399999; i>=0; i--) {
		inv[i] = inv[i+1] * (i+1) % mod;
	}

	ll n, k;
	cin >> n >> k;
	ll ans = modpow(k, n);
	for (ll i=1; i<=k-1; i++) {
		ll cur = modpow(k-i, n) * C(n+1, i) % mod;
		if (i & 1) ans = (ans - cur + mod) % mod;
		else ans = (ans + cur) % mod;
	}
	cout << ans << '\n';
}
# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 6492 KB Output is correct
2 Correct 7 ms 6492 KB Output is correct
3 Correct 7 ms 6492 KB Output is correct
4 Correct 7 ms 6492 KB Output is correct
5 Correct 7 ms 6468 KB Output is correct
6 Correct 7 ms 6492 KB Output is correct
7 Correct 7 ms 6488 KB Output is correct
8 Correct 7 ms 6744 KB Output is correct
9 Correct 7 ms 6720 KB Output is correct
10 Correct 7 ms 6492 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 6492 KB Output is correct
2 Correct 7 ms 6492 KB Output is correct
3 Correct 7 ms 6492 KB Output is correct
4 Correct 7 ms 6492 KB Output is correct
5 Correct 7 ms 6468 KB Output is correct
6 Correct 7 ms 6492 KB Output is correct
7 Correct 7 ms 6488 KB Output is correct
8 Correct 7 ms 6744 KB Output is correct
9 Correct 7 ms 6720 KB Output is correct
10 Correct 7 ms 6492 KB Output is correct
11 Correct 7 ms 6492 KB Output is correct
12 Correct 7 ms 6500 KB Output is correct
13 Correct 7 ms 6492 KB Output is correct
14 Correct 7 ms 6492 KB Output is correct
15 Correct 7 ms 6492 KB Output is correct
16 Correct 7 ms 6720 KB Output is correct
17 Correct 7 ms 6492 KB Output is correct
18 Correct 7 ms 6492 KB Output is correct
19 Correct 7 ms 6492 KB Output is correct
20 Correct 8 ms 6612 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 6492 KB Output is correct
2 Correct 7 ms 6492 KB Output is correct
3 Correct 7 ms 6492 KB Output is correct
4 Correct 7 ms 6492 KB Output is correct
5 Correct 7 ms 6468 KB Output is correct
6 Correct 7 ms 6492 KB Output is correct
7 Correct 7 ms 6488 KB Output is correct
8 Correct 7 ms 6744 KB Output is correct
9 Correct 7 ms 6720 KB Output is correct
10 Correct 7 ms 6492 KB Output is correct
11 Correct 7 ms 6492 KB Output is correct
12 Correct 7 ms 6500 KB Output is correct
13 Correct 7 ms 6492 KB Output is correct
14 Correct 7 ms 6492 KB Output is correct
15 Correct 7 ms 6492 KB Output is correct
16 Correct 7 ms 6720 KB Output is correct
17 Correct 7 ms 6492 KB Output is correct
18 Correct 7 ms 6492 KB Output is correct
19 Correct 7 ms 6492 KB Output is correct
20 Correct 8 ms 6612 KB Output is correct
21 Correct 8 ms 6492 KB Output is correct
22 Correct 7 ms 6532 KB Output is correct
23 Correct 7 ms 6652 KB Output is correct
24 Correct 7 ms 6492 KB Output is correct
25 Correct 7 ms 6488 KB Output is correct
26 Correct 8 ms 6492 KB Output is correct
27 Correct 7 ms 6492 KB Output is correct
28 Correct 7 ms 6492 KB Output is correct
29 Correct 8 ms 6492 KB Output is correct
30 Correct 7 ms 6492 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 6492 KB Output is correct
2 Correct 7 ms 6492 KB Output is correct
3 Correct 7 ms 6492 KB Output is correct
4 Correct 7 ms 6492 KB Output is correct
5 Correct 7 ms 6468 KB Output is correct
6 Correct 7 ms 6492 KB Output is correct
7 Correct 7 ms 6488 KB Output is correct
8 Correct 7 ms 6744 KB Output is correct
9 Correct 7 ms 6720 KB Output is correct
10 Correct 7 ms 6492 KB Output is correct
11 Correct 7 ms 6492 KB Output is correct
12 Correct 7 ms 6500 KB Output is correct
13 Correct 7 ms 6492 KB Output is correct
14 Correct 7 ms 6492 KB Output is correct
15 Correct 7 ms 6492 KB Output is correct
16 Correct 7 ms 6720 KB Output is correct
17 Correct 7 ms 6492 KB Output is correct
18 Correct 7 ms 6492 KB Output is correct
19 Correct 7 ms 6492 KB Output is correct
20 Correct 8 ms 6612 KB Output is correct
21 Correct 8 ms 6492 KB Output is correct
22 Correct 7 ms 6532 KB Output is correct
23 Correct 7 ms 6652 KB Output is correct
24 Correct 7 ms 6492 KB Output is correct
25 Correct 7 ms 6488 KB Output is correct
26 Correct 8 ms 6492 KB Output is correct
27 Correct 7 ms 6492 KB Output is correct
28 Correct 7 ms 6492 KB Output is correct
29 Correct 8 ms 6492 KB Output is correct
30 Correct 7 ms 6492 KB Output is correct
31 Correct 7 ms 6492 KB Output is correct
32 Correct 7 ms 6584 KB Output is correct
33 Correct 7 ms 6492 KB Output is correct
34 Correct 8 ms 6492 KB Output is correct
35 Correct 12 ms 6492 KB Output is correct
36 Correct 13 ms 6492 KB Output is correct
37 Correct 14 ms 6492 KB Output is correct
38 Correct 9 ms 6748 KB Output is correct
39 Correct 10 ms 6496 KB Output is correct
40 Correct 10 ms 6744 KB Output is correct