Cod sursa(job #2636538)

Utilizator BogdanFarcasBogdan Farcas BogdanFarcas Data 18 iulie 2020 16:48:22
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.21 kb
#include <fstream>
#include <vector>
#include <queue>
#include <cstring>

using namespace std;

ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

const int N=5e4+1;

vector< pair<int,int> >v[N];
queue<int>q;

int n,m,x,y,val;
int ans[N];
bool inq[N];

void dijsktra(int start)
{
    memset(ans,-1,sizeof(ans));
    q.push(start);
    inq[start]=true;
    ans[start]=0;
    while(!q.empty())
    {
        int nodCurent=q.front();
        q.pop();
        inq[nodCurent]=false;
        for(size_t i=0;i<v[nodCurent].size();i++)
        {
            int vecin=v[nodCurent][i].first;
            int cost=v[nodCurent][i].second;
            if(ans[nodCurent]+cost<ans[vecin]||(ans[vecin]==-1))
            {
                ans[vecin]=ans[nodCurent]+cost;
                if(inq[vecin]==false)
                {
                    q.push(vecin);
                    inq[vecin]=true;
                }
            }
        }
    }
}

int main()
{
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y>>val;
        v[x].push_back(make_pair(y,val));
    }
    dijsktra(1);
    for(int i=2;i<=n;i++)
    {
        fout<<ans[i]<<" ";
    }
    return 0;
}