Submission #3622321

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Source Code Expand

#include <cstdio>
using namespace std;

typedef long long LL;

const int N = 4010;
const LL mod = 998244353;

int n, m;

LL C[N][N], pow[N];

void init()
{
	C[0][0] = 1;
	for (int i = 1; i <= n + m; ++ i)
	{
		C[i][0] = 1;
		for (int j = 1; j <= i; ++ j)
			C[i][j] = (C[i - 1][j - 1] + C[i - 1][j]) %  mod;
	}
	pow[0] = 1;
	for (int i = 1; i <= m; ++ i) pow[i] = pow[i - 1] * 2 % mod;
}

LL calc(int k, int x, int y) { return C[k + y - 1][x + y - 1]; }

int main()
{
	scanf("%d %d", &m, &n);
	init();
	for (int i = 2; i <= m << 1; ++ i)
	{
		LL ans = 0;
		int p = 0;
		for (int j = 1; j <= m; ++ j)
		{
			if (i - j <= j) break;
			p += 1 <= i - j && i - j <= m;
		}
		if (i & 1)
		{
			for (int q = 0; q <= p; ++ q)
				(ans += C[p][q] * pow[q] * calc(n, q, m - (p << 1))) %= mod;
		}
		else
		{
			for (int q = 0; q <= p; ++ q)
			{
				(ans += C[p][q] * pow[q] * calc(n, q, m - (p << 1) - 1)) %= mod;
				(ans += C[p][q] * pow[q] * calc(n - 1, q, m - (p << 1) - 1)) %= mod;
			}
		}
		printf("%lld\n", ans);
	}
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:30:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &m, &n);
                        ^

Judge Result