Pagini recente » Cod sursa (job #1303869) | Cod sursa (job #1279181) | Cod sursa (job #2670331) | Cod sursa (job #1513856) | Cod sursa (job #535519)
Cod sursa(job #535519)
#include<stdio.h>
#include<algorithm>
#include<queue>
#include<list>
using namespace std;
#define INF 1<<30
#define MAXSIZE 50001
#define cost first
#define poz second
vector<int> dist;
int from,to,cost,n,m,i;
list< pair<int,int> > graph[MAXSIZE];
priority_queue< pair<int,int>,vector< pair<int,int> >,greater<pair<int,int> > > myHeap;
void dijkstra(int);
inline bool isInf(int number) { return (number == INF); };
FILE *in,*out;
int main()
{
in=fopen("dijkstra.in","rt");
out=fopen("dijkstra.out","wt");
fscanf(in,"%d %d",&n,&m);
dist.resize(n+1);
for(i=1;i<=n;i++)
{
fscanf(in,"%d %d %d",&from,&to,&cost);
graph[from].push_back(make_pair(cost,to));
}
fclose(in);
dijkstra(1);
for(i=2;i<=n;i++)
fprintf(out,"%d ",dist[i]==INF ? 0:dist[i]);
fclose(out);
return 0;
}
void dijkstra(int StartNode)
{
dist.assign(n+1,INF);
dist[StartNode]=0;
pair<int,int> CurrentNode;
list< pair<int,int> >::iterator vecin;
myHeap.push(make_pair(0,StartNode));
while(!myHeap.empty())
{
CurrentNode=myHeap.top();
myHeap.pop();
for(vecin=graph[CurrentNode.poz].begin();vecin!=graph[CurrentNode.poz].end();++vecin)
if(dist[vecin->poz]>dist[CurrentNode.poz]+vecin->cost)
{
dist[vecin->poz]=dist[CurrentNode.poz]+vecin->cost;
myHeap.push(make_pair(dist[vecin->poz],vecin->poz));
}
}
}