Cod sursa(job #221421)

Utilizator tvladTataranu Vlad tvlad Data 16 noiembrie 2008 14:08:20
Problema 1-sir Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.61 kb
#include <cstdio>
#include <cmath>

const int N = 256;
const int S = N*(N+1)/2;
const int MOD = 194767;

int n,s, sn;
int d[2][S+1];

inline int abs ( int x ) { return (x < 0) ? -x : x; }

int main() {
	freopen("1-sir.in","rt",stdin);
	freopen("1-sir.out","wt",stdout);
	scanf("%d %d",&n,&s);
	d[1][0] = 1;
	sn = n*(n+1)/2;
	if (abs(s) > sn) {
		printf("0\n");
		return 0;
	}
	for (int i = 2, cur = 0; i <= n; ++i) {
		for (int j = 0; j <= sn; ++j) {
			d[cur][j] = (d[1-cur][abs(j-(i-1))] + d[1-cur][abs(j+(i-1))]) % MOD;
		}
		cur = 1-cur;
	}
	printf("%d\n",d[n%2][abs(s)]);
	return 0;
}