Cod sursa(job #1365468)

Utilizator CosminRusuCosmin Rusu CosminRusu Data 28 februarie 2015 12:06:30
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.13 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
#include <string.h>

using namespace std;

const int maxn = 100005;
const int oo = 0x3f3f3f3f;

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

int n, m, dist[maxn];
vector <pair<int, int> > g[maxn];
priority_queue <pair<int, int> > q;

inline void dijkstra() {
    memset(dist, oo, sizeof(dist));
    dist[1] = 0;
    q.push(make_pair(0, 1));
    while(!q.empty()) {
        int node = q.top().second;
        int cost = -q.top().first;
        q.pop();
        for(vector <pair<int, int> > :: iterator it = g[node].begin() ; it != g[node].end() ; ++ it)
            if(dist[it->first] > dist[node] + it->second) {
                dist[it->first] = dist[node] + it->second;
                q.push(make_pair(-dist[it->first], it->first));
            }
    }
    for(int i = 2 ; i <= n ; ++ i) {
        if(dist[i] == oo)
            dist[i] = 0;
        fout << dist[i] << ' ';
    }
}

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