Cod sursa(job #961047)

Utilizator primulDarie Sergiu primul Data 11 iunie 2013 16:34:18
Problema 1-sir Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.74 kb
#include <iostream>
#include <fstream>
#include <cstdlib>
#define DN 260
#define MOD 194767
 
using namespace std;
 
ifstream f("1-sir.in"); ofstream g("1-sir.out");
 
 
int dp[4][DN * DN];
 
int main()
{
    int n;
    long long s;
 
    f >> n >> s;
    if(s < 0)
        s =- s;
    int smax = n * (n - 1) / 2;
    if(s > smax)
    {
        g<<0;
        return 0;
    }
 
    bool p=1;
    dp[1][0]=1;
    for(int i=2;i<=n;++i)
        {
            for(int sum=0;sum<=smax;++sum)
            {
                dp[!p][sum]=dp[p][sum+i-1]+dp[p][abs(sum-i+1)];
 
                if(dp[!p][sum]>=MOD)
                    dp[!p][sum]-=MOD;
            }
            p=!p;
        }
    g<<dp[p][s];
 
    return 0;
}