提出 #36747434

---

ソースコード 拡げる

#include<bits/stdc++.h>
#define MOD 998244353
#define LL long long
using namespace std;
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;
}
void Inc(int &a, const int &b)
{
	((a += b) >= MOD) && (a -= MOD);
}
void Mul(int &a, const int &b)
{
	a = 1LL * a * b % MOD;
}
void Sqr(int &a)
{
	a = 1LL * a * a % MOD;
}
int qwqmi(int x, int k = MOD - 2)
{
	int res = 1;
	while(k)
	{
		if(k & 1) Mul(res, x);
		Sqr(x), k >>= 1;
	}
	return res;
}
const int N = 2e5 + 5;
const int inv2 = qwqmi(2);
int n, m, Q, ans;
int p[N], invp[N];
int main()
{
	scanf("%d %d %d", &n, &m, &Q);
	int w = qwqmi(mul(2 * m + 1, mul(n, n + 1)));
	for(int i = 1; i <= n; ++i)
	{
		int v = mul(i, n - i + 1);
		p[i] = mul(mul(2 * m, v), w);
		invp[i] = qwqmi(p[i]);
		int x = 1;
		Mul(x, mul(m - 1, v));
		Mul(x, w);
		Mul(x, dec(Q, mul(dec(1, qwqmi(dec(1, p[i]), Q)), invp[i])));
		Inc(ans, x);
	}
	
	Mul(ans, qwqmi(mul(2 * m + 1, mul(mul(n, n + 1), inv2)), Q));
	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:41:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   41 |  scanf("%d %d %d", &n, &m, &Q);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

ジャッジ結果