Cod sursa(job #2416809)

Utilizator stelian2000Stelian Chichirim stelian2000 Data 28 aprilie 2019 11:58:21
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.12 kb
#include <bits/stdc++.h>

using namespace std;

const int inf=1e9;

vector<pair<int,int>> v[50010];
queue<int> q;
int d[50010],cnt[50010];
char vaz[50010];

int main()
{
    freopen("bellmanford.in","r",stdin);
    freopen("bellmanford.out","w",stdout);
    int n,m,x,y,c;
    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});
    }
    for(int i=1;i<=n;i++) d[i]=inf;
    vaz[1]=1;
    cnt[1]=1;
    d[1]=0;
    q.push(1);
    while(!q.empty())
    {
        int nod=q.front();
        q.pop();
        vaz[nod]=0;
        for(int i=0;i<v[nod].size();i++)
        {
            int vec=v[nod][i].first,c=v[nod][i].second;
            if(d[nod]+c<d[vec])
            {
                d[vec]=d[nod]+c;
                if(!vaz[vec])
                {
                    vaz[vec]=1;
                    cnt[vec]++;
                    q.push(vec);
                    if(cnt[nod]==n) {printf("Ciclu negativ!");return 0;}
                }
            }
        }
    }
    for(int i=2;i<=n;i++) printf("%d ",d[i]);
    return 0;
}