Cod sursa(job #1841436)

Utilizator ionanghelinaIonut Anghelina ionanghelina Data 5 ianuarie 2017 17:15:33
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.33 kb
#include<bits/stdc++.h>
#define maxN 50005
#define INF INT_MAX
using namespace std;
int n,m,x,y,c,cost[maxN],nod,Used[maxN];
bool InQueue[maxN];
vector<pair<int,int> > v[maxN];
deque<int> q;
int main()
{
    freopen("bellmanford.in","r",stdin);
    freopen("bellmanford.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(int i=1;i<=m;i++)
    {
        scanf("%d%d%d",&x,&y,&c);
        v[x].push_back({y,c});
    }
    cost[1]=0;
    for(int i=2;i<=n;i++) cost[i]=INF;
    q.push_back(1);
    InQueue[1]=1;
    Used[1]=1;
    while(!q.empty())
    {
        nod=q.front();
        for(vector<pair<int,int> >::iterator it=v[nod].begin();it!=v[nod].end();it++)
        {
            if((cost[nod]+(*it).second)<cost[(*it).first])
            {
                cost[(*it).first]=cost[nod]+(*it).second;
                if(!InQueue[(*it).first])
                {
                    q.push_back((*it).first);
                    InQueue[(*it).first]=1;
                }
                Used[(*it).first]++;
                if(Used[(*it).first]==(n+1))
                {
                    printf("Ciclu negativ!\n");
                    return 0;
                }
            }
        }
        q.pop_front();
        InQueue[nod]=0;
    }
    for(int i=2;i<=n;i++) printf("%d ",cost[i]);
    return 0;
}