Cod sursa(job #1332221)

Utilizator FapFapAdriana FapFap Data 1 februarie 2015 20:17:08
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.13 kb
#include <iostream>
#include <fstream>
#include <set>
#include <vector>
#define value first
#define node second
#define nmax 50005
#define inf (1<<28)
using namespace std;

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

vector< pair< int, int> > v[nmax];
set< pair<int, int> > s;

int n, m;
int best[nmax];

void dijkstra(){
    for(int i=2; i<=n; i++) best[i]= inf;
    s.insert(make_pair(0, 1));
    while(!s.empty()){
        int cur= s.begin()-> node;
        int cur_val= s.begin()-> value;
        s.erase(s.begin());
        for(int i=0; i<v[cur].size(); i++)
            if(best[v[cur][i].node] > cur_val+ v[cur][i].value){
                best[v[cur][i].node]= cur_val + v[cur][i].value;
                s.insert(make_pair(best[v[cur][i].node],v[cur][i].node));
            }
    }
    for(int i=2; i<=n; i++)
        if(best[i]==inf)    fout << 0 << " ";
        else    fout << best[i] << " ";
}

int main(){
    int x, y, w;
    fin >> n >> m;
    for(int i=1; i<=m; i++){
        fin >> x >> y >> w;
        v[x].push_back(make_pair(w, y));
    }
    dijkstra();
    return 0;
}