提出 #45535126

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ソースコード 拡げる

#include<bits/stdc++.h>
#define LL long long
#define DB double
#define MOD 1000000007
#define ls(x) (x << 1)
#define rs(x) (x << 1 | 1)
#define lowbit(x) ((-x) & x)
#define MP make_pair
#define PII pair<int, int>
#define VI vector<int>
#define VL vector<LL>
#define VII VI::iterator
#define VLI VL::iterator
#define all(x) x.begin(), x.end()
#define EB emplace_back
#define SI set<int>
#define SII SI::iterator
#define fi first
#define se second
using namespace std;
template<typename T> void chkmn(T &a, const T &b) { (a > b) && (a = b); }
template<typename T> void chkmx(T &a, const T &b) { (a < b) && (a = b); }
void Inc(int &a, const int &b) { ((a += b) >= MOD) && (a -= MOD); }
void Dec(int &a, const int &b) { ((a -= b) < 0) && (a += MOD); }
void Mul(int &a, const int &b) { a = 1LL * a * b % MOD; }
void Sqr(int &a) { a = 1LL * a * a % MOD; }
int inc(const int &a, const int &b) { return (a + b >= MOD) ? a + b - MOD : a + b; }
int dec(const int &a, const int &b) { return (a - b < 0) ? a - b + MOD : a - b; }
int mul(const int &a, const int &b) { return 1LL * a * b % MOD; }
int sqr(const int &a) { return 1LL * a * a % MOD; }
int qwqmi(int x, int k = MOD - 2)
{
	int res = 1;
	while(k)
	{
		if(k & 1) Mul(res, x);
		k >>= 1, Sqr(x);
	}
	return res;
}
const int N = 1e6 + 5;
int fac[N], facinv[N];
void preprocess()
{
	fac[0] = facinv[0] = 1;
	for(int i = 1; i < N; ++i)
		fac[i] = mul(fac[i - 1], i);
	facinv[N - 1] = qwqmi(fac[N - 1]);
	for(int i = N - 2; i >= 1; --i)
		facinv[i] = mul(facinv[i + 1], i + 1);
}
int C(int n, int m)
{
	if(n < m) return 0;
	return mul(fac[n], mul(facinv[m], facinv[n - m]));
}
int n, ans;
int main()
{
	preprocess();
	scanf("%d", &n);
	for(int i = (n + 1) / 2; i < n; ++i)
		Inc(ans, mul(C(i - 1, n - i - 1), mul(fac[i], fac[n - 1 - i])));
	ans = dec(fac[n], ans);
	printf("%d\n", ans);
	return 0;
}

提出情報

コンパイルエラー

Main.cpp: In function ‘int main()’:
Main.cpp:61:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   61 |         scanf("%d", &n);
      |         ~~~~~^~~~~~~~~~

ジャッジ結果