Cod sursa(job #1536622)

Utilizator rzvrzvNicolescu Razvan rzvrzv Data 26 noiembrie 2015 14:21:44
Problema Algoritmul Bellman-Ford Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.3 kb
#include<cstdio>
#include<vector>
#define inf 0x3f3f3f3f
#include<queue>

using namespace std;

vector< pair<int,int> >g[50002];
queue<int> q;
int ap[50002],best[50002],i,n,x,y,z,m,next,crt;
bool inq[50002];

int main()
{
    freopen("bellmanford.in","r",stdin);
    freopen("bellmanford.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(i=1;i<=m;i++)
    {
        scanf("%d%d%d",&x,&y,&z);
        g[x].push_back({y,z});
    }
    for(i=1;i<=n;i++)
    {
        best[i]=inf;
    }
    best[1]=0;
    inq[1]=true;
    q.push(1);
    while(!q.empty())
    {
        crt=q.front();
        q.pop();
        inq[crt]=false;
        for(i=0;i<g[crt].size();i++)
        {
            next=g[crt][i].first;
            if(best[next]>best[crt]+g[crt][i].second)
            {
                best[next]=best[crt]+g[crt][i].second;
                if(!inq[next])
                {
                    inq[next]=true;
                    q.push(next);
                    ap[next]++;
                    if(ap[next]>n)
                    {
                        printf("Ciclu negativ!\n");
                        return 0;
                    }
                }
            }
        }
    }
    for(i=2;i<=n;i++)
    {
        printf("%d ",best[i]);
    }
    return 0;
}