Cod sursa(job #2964998)

Utilizator aaagabiTurbinca Gabriel aaagabi Data 14 ianuarie 2023 11:16:30
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.09 kb
#include <bits/stdc++.h>

using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
vector <pair<int,int>> v[50005];
int uz[50005],dmin[50005];
typedef long long ll;
int n,m,x,y,c;
set <pair<int,int>> s;
queue <int> q;
bool negativ;
int nr[200005];
void bellmanford(int start)
{
    for(int i=0;i<=n;i++)
        dmin[i]=2e9;
    dmin[start]=0;
    q.push(start);
    while(!q.empty()&&!negativ)
    {
        int x=q.front();
        q.pop();
        for(int i=0;i<v[x].size();i++)
            if(dmin[v[x][i].first]>dmin[x]+v[x][i].second)
        {
            dmin[v[x][i].first]=dmin[x]+v[x][i].second;
            nr[v[x][i].first]++;
            q.push(v[x][i].first);
            if(nr[v[x][i].first]>n)
                negativ=1;
        }
    }
}
int main()
{
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y>>c;
        v[x].push_back(make_pair(y,c));
    }
    bellmanford(1);
    if(negativ)
        fout<<"Ciclu negativ!";
    else
        for(int i=2;i<=n;i++)
        fout<<dmin[i]<<' ';
    return 0;
}