#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <iterator>
#include <memory>
#include <numeric>
#include <functional>
#include <sstream>
#include <queue>
#include <deque>
#include <list>
#include <vector>
#include <stack>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <bitset>
#include <tuple>
#include <string>
#include <cstring>
#include <cmath>
#include <cstdio>
#include <cassert>
#include <climits>
#include <ctime>
using namespace std;
#define rep(i, x, y) for(int i = x; i <= y; ++i)
#define mp make_pair
#define add push_back
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define mem(a,b) memset(a, b, sizeof(a))
#pragma warning(disable:4996)
#pragma comment(linker, "/STACK:20000007")
#pragma GCC optimize("unroll-loops")
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ld;
typedef pair <int, int> pii;
typedef vector <int> lnum;
const int N = (int)1e6 + 100;
const int maxn = (int)1e3 + 100;
const int base = (int)1e9;
const int mod = (int)1e9 + 7;
const int inf = INT_MAX;
const long long ll_inf = LLONG_MAX;
const long double pi = acos((long double)-1.0);
const long double eps = 1e-8;
int T(int n, int k) {
if (n < 0 || k < 0) return 0;
if (n == 1 && k == 1) return 1;
return k * T(n - 1, k) % mod + (n - k + 1) * T(n - 1, k - 1) % mod;
}
void solve() {
int n, k; cin >> n >> k;
cout << T(n, k) % mod << endl;
}
int main() {
//ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
//#define Freopen
#ifdef Freopen
#ifndef _MSC_VER
#define TASK ""
freopen(TASK".in", "r", stdin);
freopen(TASK".out", "w", stdout);
#endif
#endif
int T = 1;
//scanf("%d", &T);
for (; T; --T) solve();
#ifdef DEBUG
cerr << double(1.0 * clock() / CLOCKS_PER_SEC) << '\n';
#endif
return 0;
}
Compilation message
asceticism.cpp:38:0: warning: ignoring #pragma warning [-Wunknown-pragmas]
#pragma warning(disable:4996)
asceticism.cpp:39:0: warning: ignoring #pragma comment [-Wunknown-pragmas]
#pragma comment(linker, "/STACK:20000007")
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
248 KB |
Output is correct |
2 |
Correct |
2 ms |
356 KB |
Output is correct |
3 |
Correct |
2 ms |
432 KB |
Output is correct |
4 |
Correct |
2 ms |
432 KB |
Output is correct |
5 |
Correct |
2 ms |
508 KB |
Output is correct |
6 |
Correct |
2 ms |
584 KB |
Output is correct |
7 |
Correct |
2 ms |
584 KB |
Output is correct |
8 |
Correct |
2 ms |
584 KB |
Output is correct |
9 |
Correct |
2 ms |
584 KB |
Output is correct |
10 |
Correct |
2 ms |
584 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
248 KB |
Output is correct |
2 |
Correct |
2 ms |
356 KB |
Output is correct |
3 |
Correct |
2 ms |
432 KB |
Output is correct |
4 |
Correct |
2 ms |
432 KB |
Output is correct |
5 |
Correct |
2 ms |
508 KB |
Output is correct |
6 |
Correct |
2 ms |
584 KB |
Output is correct |
7 |
Correct |
2 ms |
584 KB |
Output is correct |
8 |
Correct |
2 ms |
584 KB |
Output is correct |
9 |
Correct |
2 ms |
584 KB |
Output is correct |
10 |
Correct |
2 ms |
584 KB |
Output is correct |
11 |
Execution timed out |
1079 ms |
584 KB |
Time limit exceeded |
12 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
248 KB |
Output is correct |
2 |
Correct |
2 ms |
356 KB |
Output is correct |
3 |
Correct |
2 ms |
432 KB |
Output is correct |
4 |
Correct |
2 ms |
432 KB |
Output is correct |
5 |
Correct |
2 ms |
508 KB |
Output is correct |
6 |
Correct |
2 ms |
584 KB |
Output is correct |
7 |
Correct |
2 ms |
584 KB |
Output is correct |
8 |
Correct |
2 ms |
584 KB |
Output is correct |
9 |
Correct |
2 ms |
584 KB |
Output is correct |
10 |
Correct |
2 ms |
584 KB |
Output is correct |
11 |
Execution timed out |
1079 ms |
584 KB |
Time limit exceeded |
12 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
248 KB |
Output is correct |
2 |
Correct |
2 ms |
356 KB |
Output is correct |
3 |
Correct |
2 ms |
432 KB |
Output is correct |
4 |
Correct |
2 ms |
432 KB |
Output is correct |
5 |
Correct |
2 ms |
508 KB |
Output is correct |
6 |
Correct |
2 ms |
584 KB |
Output is correct |
7 |
Correct |
2 ms |
584 KB |
Output is correct |
8 |
Correct |
2 ms |
584 KB |
Output is correct |
9 |
Correct |
2 ms |
584 KB |
Output is correct |
10 |
Correct |
2 ms |
584 KB |
Output is correct |
11 |
Execution timed out |
1079 ms |
584 KB |
Time limit exceeded |
12 |
Halted |
0 ms |
0 KB |
- |