답안 #19881

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
19881	2016-02-25T06:34:06 Z	algoshipda	괄호 (kriii4_R)	C++14	8 / 100	216 ms	1720 KB

R

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

typedef long long lld;
const int MOD = 1e9 + 7;
const int MN = 1e6 + 10;
int fpow(int n, int k)
{
	if(k == 0) return 1;
	if(k % 2){
		return 1ll * n * fpow(n, k - 1) % MOD;
	}
	int h = fpow(n, k / 2);
	return 1ll * h * h % MOD;
}

inline int inv(int n)
{
	return 1ll * fpow(n, MOD - 2) % MOD;
}

inline void mult(int& a, int b)
{
	a = 1ll * a * b % MOD;
}

inline int mult2(int a, int b)
{
	return 1ll * a * b % MOD;
}

inline void sub(int& a, int b)
{
	a = ((a - b) % MOD + MOD) % MOD;
}

inline int rational(int a, int b)
{
	return 1ll * a * inv(b) % MOD;
}

inline void add(int &a, int b)
{
	a = ((a + b) % MOD + MOD) % MOD;
}

inline int add2(int a, int b)
{
	return ((a + b) % MOD + MOD) % MOD;
}

int nCr(int n, int r)
{
	int ans = 1;
	for(int i = 1; i <= r; ++i){
		mult(ans, inv(i));
		mult(ans, n - i + 1);
	}
	return ans;
}
int main()
{
	int n, k;
	cin >> n >> k;
	if(n == 1){
		cout << 1 << '\n';
		return 0;
	}
	cout << nCr(n, n/2) << '\n';
}

Subtask #1

8.0 / 8.0

#	결과	실행 시간	메모리	Grader output
1	Correct	66 ms	1720 KB	Output is correct
2	Correct	13 ms	1720 KB	Output is correct
3	Correct	159 ms	1720 KB	Output is correct
4	Correct	178 ms	1720 KB	Output is correct
5	Correct	181 ms	1720 KB	Output is correct
6	Correct	100 ms	1720 KB	Output is correct
7	Correct	112 ms	1720 KB	Output is correct
8	Correct	75 ms	1720 KB	Output is correct
9	Correct	31 ms	1720 KB	Output is correct
10	Correct	8 ms	1720 KB	Output is correct
11	Correct	5 ms	1720 KB	Output is correct
12	Correct	163 ms	1720 KB	Output is correct
13	Correct	153 ms	1720 KB	Output is correct
14	Correct	67 ms	1720 KB	Output is correct
15	Correct	71 ms	1720 KB	Output is correct
16	Correct	65 ms	1720 KB	Output is correct
17	Correct	194 ms	1720 KB	Output is correct
18	Correct	203 ms	1720 KB	Output is correct
19	Correct	216 ms	1720 KB	Output is correct
20	Correct	215 ms	1720 KB	Output is correct

Subtask #2

0.0 / 92.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	59 ms	1720 KB	Output isn't correct
2	Halted	0 ms	0 KB	-