Cod sursa(job #3328067)

Utilizator Aditz8Cozma Daniel Adrian Aditz8 Data 6 decembrie 2025 09:56:27
Problema Algoritmul lui Dijkstra Scor 60
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.33 kb
#include <bits/stdc++.h>

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

struct nume{
    int nod,val;
};

const int VMAX=5e4+10;

vector<nume>arb[VMAX];
priority_queue<nume>heap;

int n,m,dp[VMAX],x,y,z;
bool viz[VMAX];

inline bool operator<(nume x,nume y)
{
    return x.val<y.val;
}

void dijkstra(int nod)
{
    for(int i=1;i<=n;i++)
    {
        dp[i]=2e9;
    }
    dp[nod]=0;
    viz[nod]=1;
    heap.push({nod,0});
    while(!heap.empty())
    {
        nod=heap.top().nod;
        heap.pop();
        viz[nod]=0;
        for(auto& it : arb[nod])
        {
            if(dp[it.nod]>dp[nod]+it.val)
            {
                dp[it.nod]=dp[nod]+it.val;
                if(viz[it.nod]==0)
                {
                    viz[it.nod]=1;
                    heap.push({it.nod,dp[it.nod]});
                }
            }
        }
    }
}

int main()
{
    ios::sync_with_stdio(false);
    fin.tie(0);
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y>>z;
        arb[x].push_back({y,z});
    }
    dijkstra(1);
    for(int i=2;i<=n;i++)
    {
        if(dp[i]!=2e9)
        {
            fout<<dp[i]<<' ';
        }
        else
        {
            fout<<0<<' ';
        }
    }
    fout<<'\n';
    return 0;
}