Cod sursa(job #1261075)

Utilizator george_stelianChichirim George george_stelian Data 11 noiembrie 2014 22:04:37
Problema Andrei Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.52 kb
#include <cstdio>
#include <vector>

using namespace std;

vector<int> v[200010],vt[200010];
int q[200010],n,nr;
char vaz[200010],sol[200010];

int none(int x)
{
    if(x<=n) return x+n;
    else return x-n;
}

void add_edge(int x,int y)
{
    v[x].push_back(y);
    vt[y].push_back(x);
}

void dfs1(int nod)
{
    vaz[nod]=1;
    for(vector<int>::iterator it=v[nod].begin();it!=v[nod].end();it++)
        if(!vaz[*it]) dfs1(*it);
    q[++nr]=nod;
}

void dfs2(int nod)
{
    vaz[nod]=sol[nod]=0;
    sol[none(nod)]=1;
    for(vector<int>::iterator it=vt[nod].begin();it!=vt[nod].end();it++)
        if(vaz[*it]) dfs2(*it);
}

int main()
{
    freopen("andrei.in", "r", stdin);
    freopen("andrei.out", "w", stdout);
    int m,x,y,a;
    scanf("%d%d",&n,&m);
    for(int i=1;i<=m;i++)
    {
        scanf("%d%d%d",&x,&y,&a);
        if(a==0)
        {
            add_edge(none(x),y);            // x || y
            add_edge(none(y),x);
        }
        else if(a==1)
        {
            add_edge(x,none(y));           // !x || !y
            add_edge(y,none(x));
        }
        else
        {
            add_edge(none(x),none(y));    // !(!x && y) && !(x || !y) = (x || !y) && (!x || y)
            add_edge(y,x);
            add_edge(x,y);
            add_edge(none(y),none(x));
        }
    }
    for(int i=1;i<=2*n;i++) if(!vaz[i]) dfs1(i);
    for(int i=nr;i;i--) if(vaz[q[i]] && vaz[none(q[i])]) dfs2(q[i]);
    for(int i=1;i<=n;i++) printf("%d ",sol[i]);
    return 0;
}