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답안 #158154

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
158154 2019-10-15T05:43:06 Z fedoseevtimofey Asceticism (JOI18_asceticism) C++14
100 / 100
 30 ms 1144 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

const int N = 1e5 + 7;

const int md = 1e9 + 7;

void add(int &a, int b) {
    a += b;
    if (a >= md) a -= md;
}

void sub(int &a, int b) {
    a -= b;
    if (a < 0) a += md;
}

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

int power(int a, ll b) {
    int res = 1;
    while (b > 0) {
        if (b & 1) res = mul(res, a);
        a = mul(a, a);
        b >>= 1;
    }
    return res;
}

int inv(int x) {
    return power(x, md - 2);
}

int f[N], rf[N];

int C(int n, int k) {
    return mul(f[n], mul(rf[n - k], rf[k]));
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0); cout.setf(ios::fixed); cout.precision(20);
    #ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif
    int n, k;
    cin >> n >> k;
    --k;
    f[0] = 1;
    for (int i = 1; i < N; ++i) f[i] = mul(f[i - 1], i);
    for (int i = 0; i < N; ++i) rf[i] = inv(f[i]);
    int ans = 0;
    for (int i = 0; i <= k; ++i) {
        int cur = mul(C(n + 1, i), power(k + 1 - i, n));
        if (i % 2 == 0) add(ans, cur);
        else sub(ans, cur);
    }
    cout << ans << '\n';
}

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 21 ms 1144 KB Output is correct
2 Correct 20 ms 1144 KB Output is correct
3 Correct 21 ms 1144 KB Output is correct
4 Correct 21 ms 1144 KB Output is correct
5 Correct 21 ms 1116 KB Output is correct
6 Correct 21 ms 1144 KB Output is correct
7 Correct 21 ms 1144 KB Output is correct
8 Correct 20 ms 1144 KB Output is correct
9 Correct 21 ms 1144 KB Output is correct
10 Correct 21 ms 1140 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 21 ms 1144 KB Output is correct
2 Correct 20 ms 1144 KB Output is correct
3 Correct 21 ms 1144 KB Output is correct
4 Correct 21 ms 1144 KB Output is correct
5 Correct 21 ms 1116 KB Output is correct
6 Correct 21 ms 1144 KB Output is correct
7 Correct 21 ms 1144 KB Output is correct
8 Correct 20 ms 1144 KB Output is correct
9 Correct 21 ms 1144 KB Output is correct
10 Correct 21 ms 1140 KB Output is correct
11 Correct 20 ms 1144 KB Output is correct
12 Correct 20 ms 1144 KB Output is correct
13 Correct 21 ms 1116 KB Output is correct
14 Correct 20 ms 1144 KB Output is correct
15 Correct 21 ms 1144 KB Output is correct
16 Correct 21 ms 1140 KB Output is correct
17 Correct 21 ms 1144 KB Output is correct
18 Correct 20 ms 1144 KB Output is correct
19 Correct 21 ms 1144 KB Output is correct
20 Correct 20 ms 1144 KB Output is correct

Subtask #3
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 21 ms 1144 KB Output is correct
2 Correct 20 ms 1144 KB Output is correct
3 Correct 21 ms 1144 KB Output is correct
4 Correct 21 ms 1144 KB Output is correct
5 Correct 21 ms 1116 KB Output is correct
6 Correct 21 ms 1144 KB Output is correct
7 Correct 21 ms 1144 KB Output is correct
8 Correct 20 ms 1144 KB Output is correct
9 Correct 21 ms 1144 KB Output is correct
10 Correct 21 ms 1140 KB Output is correct
11 Correct 20 ms 1144 KB Output is correct
12 Correct 20 ms 1144 KB Output is correct
13 Correct 21 ms 1116 KB Output is correct
14 Correct 20 ms 1144 KB Output is correct
15 Correct 21 ms 1144 KB Output is correct
16 Correct 21 ms 1140 KB Output is correct
17 Correct 21 ms 1144 KB Output is correct
18 Correct 20 ms 1144 KB Output is correct
19 Correct 21 ms 1144 KB Output is correct
20 Correct 20 ms 1144 KB Output is correct
21 Correct 21 ms 1060 KB Output is correct
22 Correct 20 ms 1144 KB Output is correct
23 Correct 20 ms 1144 KB Output is correct
24 Correct 21 ms 1116 KB Output is correct
25 Correct 20 ms 1144 KB Output is correct
26 Correct 20 ms 1144 KB Output is correct
27 Correct 21 ms 1060 KB Output is correct
28 Correct 21 ms 1144 KB Output is correct
29 Correct 21 ms 1144 KB Output is correct
30 Correct 21 ms 1144 KB Output is correct

Subtask #4
51.0 / 51.0

# 결과 실행 시간 메모리 Grader output
1 Correct 21 ms 1144 KB Output is correct
2 Correct 20 ms 1144 KB Output is correct
3 Correct 21 ms 1144 KB Output is correct
4 Correct 21 ms 1144 KB Output is correct
5 Correct 21 ms 1116 KB Output is correct
6 Correct 21 ms 1144 KB Output is correct
7 Correct 21 ms 1144 KB Output is correct
8 Correct 20 ms 1144 KB Output is correct
9 Correct 21 ms 1144 KB Output is correct
10 Correct 21 ms 1140 KB Output is correct
11 Correct 20 ms 1144 KB Output is correct
12 Correct 20 ms 1144 KB Output is correct
13 Correct 21 ms 1116 KB Output is correct
14 Correct 20 ms 1144 KB Output is correct
15 Correct 21 ms 1144 KB Output is correct
16 Correct 21 ms 1140 KB Output is correct
17 Correct 21 ms 1144 KB Output is correct
18 Correct 20 ms 1144 KB Output is correct
19 Correct 21 ms 1144 KB Output is correct
20 Correct 20 ms 1144 KB Output is correct
21 Correct 21 ms 1060 KB Output is correct
22 Correct 20 ms 1144 KB Output is correct
23 Correct 20 ms 1144 KB Output is correct
24 Correct 21 ms 1116 KB Output is correct
25 Correct 20 ms 1144 KB Output is correct
26 Correct 20 ms 1144 KB Output is correct
27 Correct 21 ms 1060 KB Output is correct
28 Correct 21 ms 1144 KB Output is correct
29 Correct 21 ms 1144 KB Output is correct
30 Correct 21 ms 1144 KB Output is correct
31 Correct 20 ms 1144 KB Output is correct
32 Correct 21 ms 1144 KB Output is correct
33 Correct 21 ms 1144 KB Output is correct
34 Correct 22 ms 1144 KB Output is correct
35 Correct 29 ms 1144 KB Output is correct
36 Correct 29 ms 1144 KB Output is correct
37 Correct 30 ms 1144 KB Output is correct
38 Correct 22 ms 1144 KB Output is correct
39 Correct 24 ms 1144 KB Output is correct
40 Correct 25 ms 1144 KB Output is correct