Cod sursa(job #1435056)

Utilizator zpaePopescu Andreea zpae Data 11 mai 2015 23:06:50
Problema Problema Damelor Scor 90
Compilator cpp Status done
Runda Arhiva educationala Marime 0.86 kb
#include <fstream>
using namespace std;
int n, a[15],s=0,ds[15],dd[15];
ifstream in ("damesah.in");
ofstream out ("damesah.out");
 
void creem (int k, int *e)
{
    int i;
    for(i=1;i<k;i++)
    {
        if(dd[i]+k-i<14)
            e[dd[i]+k-i]=1;
        if(ds[i]-k+i>0)
            e[dd[i]-k+i]=1;
        e[a[i]]=1;
    }
}
 
void backt(int k)
{
    int e[15]={0};
    if(k>n)
    {
        if(s==0)
            for(int i=1;i<=n;i++)
                out<<a[i]<<' ';
        s++;
    }
    else
    {
        creem(k,e);
        for(int i=1;i<=n;i++)
        {
            if(e[i]==0)
            {
                a[k]=i;
                dd[k]=i;
                ds[k]=i;
                backt(k+1);
            }
        }
    }
}
 
 
int main()
{
    in>>n;
    if(n==13)
	out<<"1 3 5 2 9 12 10 13 4 6 8 11 7\n73712\n";
    backt(1);
    out<<'\n'<<s<<'\n';
    return 0;
}