Submission #14844792

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Source Code Expand

#include <cstdio>
#include <algorithm>
using namespace std;

const int MAXN = 3000;
const int MOD = 998244353;

inline int add(int x, int y) {x += y; return x >= MOD ? x - MOD : x;}
inline int sub(int x, int y) {x -= y; return x < 0 ? x + MOD : x;}
inline int mul(int x, int y) {return (int)(1LL * x * y % MOD);}

int pow_mod(int b, int p) {
	int ret = 1;
	for(int i=p;i;i>>=1,b=mul(b,b))
		if( i & 1 ) ret = mul(ret, b);
	return ret;
}

int f[MAXN + 5][MAXN + 5], A, B, C, D;

int main() {
	scanf("%d%d%d%d", &A, &B, &C, &D);
	
	for(int i=A;i<=C;i++) {
		int tmp = 0;
		for(int j=B;j<=D;j++) {
			if( i == A && j == B ) f[A][B] = 1;
			else {
				tmp = mul(add(tmp, f[i-1][j-1]), i - 1);
				f[i][j] = add(tmp, mul(f[i-1][j], j));
			}
		}
	}
		
	int ans = 0;
	for(int i=1;i<=D;i++)
		ans = add(ans, mul(f[C][i], pow_mod(C, D - i)));
	printf("%d\n", ans);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:22:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   22 |  scanf("%d%d%d%d", &A, &B, &C, &D);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Judge Result