Cod sursa(job #1181329)

Utilizator apopeid15Apopei Daniel apopeid15 Data 2 mai 2014 15:23:34
Problema Oras Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.93 kb
#include <fstream>

using namespace std;

ifstream fin ("oras.in");
ofstream fout ("oras.out");

int G[201][201],n;

bool bfs (int x, int total)
{
    int q[10],viz[10];

    for (int i=1; i<=total; ++i)
        viz[i] = 0;

    viz[x] = 1;
    int l = 0, cnt = 1;

    for (int i=1; i<=total; ++i)
        if (G[x][i])
    {
        if (!viz[i])
        {++cnt;
         viz[i] = 1;
         q[++l] = i;
        }
    }

    for (int i=1; i<=l; ++i)
    {
        for (int j=1; j<=total; ++j)
        {
            if (G[q[i]][j])
            {
                if (!viz[j])
                {
                    ++cnt;
                    viz[j] = 1;
                }
            }
        }
    }

    if (cnt == total)
        return 1;
    return 0;
}

void generate (int x)
{
    int mask = (1<<(x*(x-1)/2));

    for (int i=0; i<mask; ++i)
    {
        int cnt = 0;

        for (int j=1; j<=x; ++j)
            for (int k = j+1; k<=x; ++k)
        {
            if ((i>>cnt)&1)
                G[j][k] = 1, G[k][j] = 0;
            else G[k][j] = 1, G[j][k] = 0;

            ++cnt;
        }

        int ok = 1;

        for (int j=1; j<=x; ++j)
            ok &= bfs(j,x);

        if (ok)
          break;
    }
}

int main()
{
    fin>>n;

    if (n == 4)
    {
        fout<<-1;
        return 0;
    }

    int st;

    if (n&1)
        generate (3),st=3;
    else generate (6),st=6;

    for (int i=st+1; i<=n; ++i)
    {
        if ((i-st)&1)
        {
            for (int j=1; j<i; ++j)
            {
                G[j][i] = 1;
            }
            G[i][i+1] = 1;
        }
        else
        {
            for (int j=1; j<i-1; ++j)
            {
                G[i][j] = 1;
            }
        }
    }

    for (int i=1; i<=n; ++i)
        {for (int j=1; j<=n; ++j)
        {fout<<G[i][j];}

        fout<<"\n";
        }
}