Cod sursa(job #3030064)

Utilizator mihnea.cazan15mihnea cazan mihnea.cazan15 Data 17 martie 2023 14:42:59
Problema Algoritmul lui Dijkstra Scor 20
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.09 kb
#include <bits/stdc++.h>
#include <fstream>
#define pii pair<int,int>

using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
const int N=1e5+5;
int n,m,d[N];
bool inq[N];
vector<pii> v[N];
void djk(int x0)
{
    for(int i=1;i<=n;i++)
        d[i]=2e9;
    d[x0]=0;
    priority_queue<pii> q;
    q.push({0,x0});
    while(!q.empty())
    {
        int x=q.top().second;
        q.pop();
        inq[x]=true;
        for(auto it:v[x])
        {
            int y=it.first;
            int c=it.second;
            if(d[x]+c<d[y])
            {
                d[y]=d[x]+c;
                if(!inq[y])
                {
                    q.push({d[y],y});
                    inq[y]=true;
                }
            }
        }
    }
}
int main()
{
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        int x,y,c;
        fin>>x>>y>>c;
        v[x].push_back({y,c});
    }
    djk(1);
    for(int i=2;i<=n;i++)
    {
        if(d[i]==2e9)
           fout<<"0 ";
        else
            fout<<d[i]<<" ";
    }
    return 0;
}