Cod sursa(job #330895)

Utilizator mihai_floreaFlorea Mihai Alexandru mihai_florea Data 11 iulie 2009 22:36:32
Problema 1-sir Scor 100
Compilator c Status done
Runda Arhiva de probleme Marime 0.53 kb
#include <stdio.h>
#define NMAX 260
#define MOD 194767
int N,S,a[2][NMAX*(NMAX+1)/2];
int abs(int x) {return x>0?x:-x;}
int main(){
    int i,j,now=1,prev=0;
    freopen("1-sir.in","r",stdin);
    freopen("1-sir.out","w",stdout);
    scanf("%d %d",&N,&S);
    a[now][0]=1;
    for (i=2;i<=N;++i)
    {
        now=i&1;prev=1-now;
        for (j=0;j<=(i-1)*i/2;++j)
          a[now][j]=(a[prev][j+i-1]+a[prev][abs(j-i+1)])%MOD;
    }
    
    printf("%d",abs(S) > (N-1)*N/2 ? 0 : a[now][abs(S)]);
    
    return 0;
}