Cod sursa(job #2322426)

Utilizator Andrei2000Andrei Mihailescu Andrei2000 Data 17 ianuarie 2019 19:27:45
Problema 1-sir Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.68 kb
#include <bits/stdc++.h>
#define mod 194767

using namespace std;

ifstream fin ("1-sir.in");
ofstream fout("1-sir.out");

int n,s,d[2][33000];
bool k=1;

inline void MOD(int &a, int b){
    a+=b;
    if(a>=mod){
        a=a%mod;
    }
}

int main()
{
    fin>>n>>s;
    s=max(s,-s);
    if(s>(n-1)*n/2)
        fout<<0<<'\n';
    else{
        d[0][0]=1;
        for(int i=2;i<=n;++i){
            for(int j=0;j<=i*(i-1)/2;++j){
                d[k][j]=0;
                MOD(d[k][j],d[k^1][abs(j-(i-1))]);
                MOD(d[k][j],d[k^1][abs(j+(i-1))]);
            }
            k^=1;
        }
        fout<<d[k^1][s]<<'\n';
    }
    return 0;
}