oj.uz

답안 #685062

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
685062 2023-01-23T08:31:09 Z peijar Asceticism (JOI18_asceticism) C++17
100 / 100
 12 ms 3452 KB 
#include <bits/stdc++.h>
#define int long long
using namespace std;

string to_string(string s) { return s; }
template <typename T> string to_string(T v) {
  bool first = true;
  string res = "[";
  for (const auto &x : v) {
    if (!first)
      res += ", ";
    first = false;
    res += to_string(x);
  }
  res += "]";
  return res;
}

void dbg_out() { cout << endl; }
template <typename Head, typename... Tail> void dbg_out(Head H, Tail... T) {
  cout << ' ' << to_string(H);
  dbg_out(T...);
}

#ifdef DEBUG
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

const int MOD = 1e9 + 7;

int add(int x, int y) {
  x += y;
  if (x >= MOD)
    x -= MOD;
  return x;
}

int sub(int x, int y) {
  x -= y;
  if (x < 0)
    x += MOD;
  return x;
}

int mult(int a, int b) { return a * b % MOD; }

int fastpow(int a, int b) {
  int ret = 1;
  for (; b; b /= 2, a = mult(a, a))
    if (b % 2)
      ret = mult(a, ret);
  return ret;
}

const int MAXN = 2e5 + 1;

int fact[MAXN], invFact[MAXN];

void initFact() {
  fact[0] = 1;
  for (int i = 1; i < MAXN; ++i)
    fact[i] = mult(i, fact[i - 1]);
  invFact[MAXN - 1] = fastpow(fact[MAXN - 1], MOD - 2);
  for (int i = MAXN - 1; i; --i)
    invFact[i - 1] = mult(i, invFact[i]);
}

int binom(int n, int k) {
  if (k < 0 or k > n)
    return 0;
  return mult(fact[n], mult(invFact[k], invFact[n - k]));
}

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

  initFact();
  int N, K;
  cin >> N >> K;
  K=N-K;

  int ret = 0;

  for (int j = 0; j <= K; ++j) {
    int toAdd = mult(binom(N + 1, j), fastpow(K + 1 - j, N));
    if (j % 2)
      ret = sub(ret, toAdd);
    else
      ret = add(ret, toAdd);
  }
  cout << ret << endl;
}

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 3412 KB Output is correct
2 Correct 4 ms 3412 KB Output is correct
3 Correct 4 ms 3412 KB Output is correct
4 Correct 4 ms 3412 KB Output is correct
5 Correct 4 ms 3412 KB Output is correct
6 Correct 4 ms 3412 KB Output is correct
7 Correct 4 ms 3412 KB Output is correct
8 Correct 4 ms 3412 KB Output is correct
9 Correct 4 ms 3412 KB Output is correct
10 Correct 4 ms 3412 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 3412 KB Output is correct
2 Correct 4 ms 3412 KB Output is correct
3 Correct 4 ms 3412 KB Output is correct
4 Correct 4 ms 3412 KB Output is correct
5 Correct 4 ms 3412 KB Output is correct
6 Correct 4 ms 3412 KB Output is correct
7 Correct 4 ms 3412 KB Output is correct
8 Correct 4 ms 3412 KB Output is correct
9 Correct 4 ms 3412 KB Output is correct
10 Correct 4 ms 3412 KB Output is correct
11 Correct 4 ms 3412 KB Output is correct
12 Correct 4 ms 3412 KB Output is correct
13 Correct 4 ms 3412 KB Output is correct
14 Correct 4 ms 3412 KB Output is correct
15 Correct 4 ms 3412 KB Output is correct
16 Correct 4 ms 3332 KB Output is correct
17 Correct 4 ms 3412 KB Output is correct
18 Correct 4 ms 3412 KB Output is correct
19 Correct 4 ms 3412 KB Output is correct
20 Correct 4 ms 3412 KB Output is correct

Subtask #3
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 3412 KB Output is correct
2 Correct 4 ms 3412 KB Output is correct
3 Correct 4 ms 3412 KB Output is correct
4 Correct 4 ms 3412 KB Output is correct
5 Correct 4 ms 3412 KB Output is correct
6 Correct 4 ms 3412 KB Output is correct
7 Correct 4 ms 3412 KB Output is correct
8 Correct 4 ms 3412 KB Output is correct
9 Correct 4 ms 3412 KB Output is correct
10 Correct 4 ms 3412 KB Output is correct
11 Correct 4 ms 3412 KB Output is correct
12 Correct 4 ms 3412 KB Output is correct
13 Correct 4 ms 3412 KB Output is correct
14 Correct 4 ms 3412 KB Output is correct
15 Correct 4 ms 3412 KB Output is correct
16 Correct 4 ms 3332 KB Output is correct
17 Correct 4 ms 3412 KB Output is correct
18 Correct 4 ms 3412 KB Output is correct
19 Correct 4 ms 3412 KB Output is correct
20 Correct 4 ms 3412 KB Output is correct
21 Correct 4 ms 3412 KB Output is correct
22 Correct 4 ms 3412 KB Output is correct
23 Correct 4 ms 3412 KB Output is correct
24 Correct 4 ms 3412 KB Output is correct
25 Correct 4 ms 3412 KB Output is correct
26 Correct 4 ms 3412 KB Output is correct
27 Correct 3 ms 3412 KB Output is correct
28 Correct 4 ms 3412 KB Output is correct
29 Correct 4 ms 3412 KB Output is correct
30 Correct 4 ms 3412 KB Output is correct

Subtask #4
51.0 / 51.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 3412 KB Output is correct
2 Correct 4 ms 3412 KB Output is correct
3 Correct 4 ms 3412 KB Output is correct
4 Correct 4 ms 3412 KB Output is correct
5 Correct 4 ms 3412 KB Output is correct
6 Correct 4 ms 3412 KB Output is correct
7 Correct 4 ms 3412 KB Output is correct
8 Correct 4 ms 3412 KB Output is correct
9 Correct 4 ms 3412 KB Output is correct
10 Correct 4 ms 3412 KB Output is correct
11 Correct 4 ms 3412 KB Output is correct
12 Correct 4 ms 3412 KB Output is correct
13 Correct 4 ms 3412 KB Output is correct
14 Correct 4 ms 3412 KB Output is correct
15 Correct 4 ms 3412 KB Output is correct
16 Correct 4 ms 3332 KB Output is correct
17 Correct 4 ms 3412 KB Output is correct
18 Correct 4 ms 3412 KB Output is correct
19 Correct 4 ms 3412 KB Output is correct
20 Correct 4 ms 3412 KB Output is correct
21 Correct 4 ms 3412 KB Output is correct
22 Correct 4 ms 3412 KB Output is correct
23 Correct 4 ms 3412 KB Output is correct
24 Correct 4 ms 3412 KB Output is correct
25 Correct 4 ms 3412 KB Output is correct
26 Correct 4 ms 3412 KB Output is correct
27 Correct 3 ms 3412 KB Output is correct
28 Correct 4 ms 3412 KB Output is correct
29 Correct 4 ms 3412 KB Output is correct
30 Correct 4 ms 3412 KB Output is correct
31 Correct 12 ms 3448 KB Output is correct
32 Correct 11 ms 3412 KB Output is correct
33 Correct 11 ms 3412 KB Output is correct
34 Correct 10 ms 3404 KB Output is correct
35 Correct 5 ms 3448 KB Output is correct
36 Correct 4 ms 3412 KB Output is correct
37 Correct 4 ms 3412 KB Output is correct
38 Correct 4 ms 3412 KB Output is correct
39 Correct 7 ms 3412 KB Output is correct
40 Correct 9 ms 3452 KB Output is correct