Pagini recente » Cod sursa (job #1091460) | Cod sursa (job #2569647) | Cod sursa (job #2208629) | Cod sursa (job #543554) | Cod sursa (job #1125803)
#include <vector>
#include <fstream>
#include <cstring>
#include <queue>
#define MAX_SIZE 50005
#define get_max( a,b) ((a)>(b)?(a):(b))
#define mk make_pair
#define INF 0x3f3f3f3f
using namespace std;
typedef vector < pair < int,int > > ::iterator vii;
ifstream in ( "dijkstra.in" );
ofstream out ( "dijkstra.out" );
vector < pair < int ,int > > G[MAX_SIZE] ;
int N , M , Cost[MAX_SIZE] ;
priority_queue < pair < int , int > , vector < pair < int , int > > , greater < pair < int , int > > > Heap;
void Dijkstra ( void )
{
int i , j ;
for ( i = 1 ; i <= N ; Cost[i++] = INF);
Cost[1] = 0 ;
Heap.push(mk( 1 , 0));
for ( ; !Heap.empty() ; )
{
int node = Heap.top().first , val = Heap.top().second;
Heap.pop();
for( i = 0 ; i <G[node].size(); ++i )
{
int newnode=G[node][i].first;
int dis=G[node][i].second;
if( Cost[newnode] > Cost[node]+dis)
{
Cost[newnode]=Cost[node]+dis;
Heap.push(mk( newnode , Cost[newnode] ) );
}
}
}
}
int main ( void )
{
int i , j , x , y , c ;
in >> N >> M ;
for ( i = 1 ; i <= M ; ++i )
{
in >> x >> y >> c ;
G[x].push_back(mk(y,c));
}
Dijkstra();
for ( i = 2 ; i <= N ; ++i )
out << ( Cost[i] == INF ? 0 : Cost[i] ) << " ";
in.close();
out.close();
return 0 ;
}