Cod sursa(job #1762462)

Utilizator gabib97Gabriel Boroghina gabib97 Data 23 septembrie 2016 16:07:00
Problema Algoritmul lui Dijkstra Scor 90
Compilator cpp Status done
Runda Arhiva educationala Marime 1.5 kb
#include <stdio.h>
#include <vector>
#include <queue>
#include <ctype.h>
#include <stdlib.h>
#define inf 100000000
using namespace std;
int n,m,i,x,y,c,*d;
char *b;
vector<pair<int,int> >G[50001];
priority_queue<int, vector<int>, greater<int> >Q;
void citire()
{
    int l,j,i;
    fseek(stdin,0,SEEK_END);
    l=ftell(stdin);
    rewind(stdin);
    b=(char*) malloc((l+1)*sizeof(char));
    fread(b,sizeof(char),l,stdin);

    for (j=0;isdigit(b[j]);j++) n=n*10+b[j]-'0';
    for (++j;isdigit(b[j]);j++) m=m*10+b[j]-'0';
    for (i=1;i<=m;i++)
    {
        x=y=c=0;
        for (++j;isdigit(b[j]);j++) x=x*10+b[j]-'0';
        for (++j;isdigit(b[j]);j++) y=y*10+b[j]-'0';
        for (++j;isdigit(b[j]);j++) c=c*10+b[j]-'0';
        G[x].push_back(make_pair(y,c));
    }
    free(b);
    d=(int*) calloc(n+1,sizeof(int));
}
void dijkstra()
{
    int i,x,y;
    for (i=2;i<=n;i++) d[i]=inf;
    Q.push(1);
    while (!Q.empty())
    {
        x=Q.top();
        Q.pop();
        for (i=0;i<G[x].size();i++)
        {
            y=G[x][i].first;
            if (d[y]>d[x]+G[x][i].second)
            {
                d[y]=d[x]+G[x][i].second;
                Q.push(y);
            }
        }
    }
}
int main()
{
    freopen ("dijkstra.in","r",stdin);
    freopen ("dijkstra.out","w",stdout);
    citire();
    dijkstra();
    for (i=2;i<=n;i++)
        if (d[i]!=inf) printf("%i ",d[i]);
        else printf("0 ");
    fclose(stdin);
    fclose(stdout);
    return 0;
}