Cod sursa(job #1881917)

Utilizator AndreidgDragomir Andrei Valentin Andreidg Data 16 februarie 2017 20:38:07
Problema Problema Damelor Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.06 kb
#include <fstream>
#include <cmath>
using namespace std;
ifstream f("damesah.in");
ofstream g("damesah.out");
int n,x[15],j;
long long nr=0;
int secdiag[30],col[15],diag[30];
bool gasit;
void afisare(){
    if(gasit==0)
    {
        gasit=1;
        nr=1;
        for(int i=1;i<=n;i++)
        {
            g<<x[i]<<" ";
        }
        g<<"\n";
    }
    else
    {
        nr++;
    }
}
bool corect(int l,int c)
{
    int k;
    if(col[c]==1)
    {
        return 0;
    }
    if(diag[c-l+n-1]==1)
    {
        return 0;
    }
    if(secdiag[l+c]==1)
    {
        return 0;
    }
    return 1;
}
void back(int i){
if(i<=n)
    {
    for(int j=1;j<=n;j++){
            x[i]=j;
            if(corect(i,j))//verific daca j este pe s1,s2,..s(i-1)
            {
                col[j]=secdiag[i+j]=diag[j-i+n-1]=1;
                back(i+1);
                col[j]=secdiag[i+j]=diag[j-i+n-1]=0;
            }
    }
    }
else
    afisare();
    return ;
}
int main()
{
    f>>n;
    back(1);
    g<<nr;
    return 0;
}