Cod sursa(job #2574673)

Utilizator tudorrrTudor Moldovan tudorrr Data 6 martie 2020 08:33:44
Problema Algoritmul Bellman-Ford Scor 35
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.08 kb
#include<fstream>
#include<vector>
#include<queue>
#include<set>
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
vector<vector<pair<int,int>>>G;
const int INF = 0x3f3f3f3f;
int D[50005];
int n,m;
void BF(int x)
{
    queue<pair<int,int>>Q;
    for(int i=1;i<=n;i++)
        D[i]=INF;
    D[x]=0;
    for(auto p : G[x])
    {
        if(D[p.second]>p.first)
            D[p.second]=p.first;
        Q.push(p);
    }
    while(!Q.empty())
    {
        auto p = Q.front();
        Q.pop();
        for(auto x : G[p.second])
        {
            if(D[x.second]>D[p.second]+x.first)
            {
                D[x.second]=D[p.second]+x.first;
                Q.push({D[x.second],x.second});
            }
        }
    }
}
int main()
{
    fin>>n>>m;
    G.resize(n+1);
    for(int i=1;i<=n;i++)
        D[i]=INF;
    for(int i=1;i<=m;i++)
    {
        int x,y,w;
        fin>>x>>y>>w;
        G[x].push_back({w,y});
    }
    D[1]=0;
    BF(1);
    for(int i=2;i<=n;i++)
        fout<<D[i]<<" ";
    return 0;
}