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Cod sursa(job #936177)
#include<fstream>
#include<vector>
#define INF 1 << 25
#define maxN 50005
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
int N,M,i,x,y,D[maxN],Poz[maxN];
int L,H[maxN];
struct mch{
int nod;
int cst;
}aux;
vector<mch>A[maxN];
void urca(int poz){
while ( poz != 0 && D[ H[poz/2] ] > D[ H[poz] ] ){
swap(H[poz],H[poz/2]);
swap(Poz[H[poz]],Poz[H[poz/2]]);
poz = poz >> 1;
}
}
void coboara(int x){
int y = 0;
while ( x != y ){
y = x;
if ( (y << 1) <= L && D[H[ y << 1 ]] < D[H[ x ]] )
x = y << 1;
if ( (y << 1) + 1 <= L && D[H[(y<<1)+1]] < D[H[ x ]] )
x = ( y << 1 ) + 1;
swap(H[x],H[y]);
swap(Poz[H[x]],Poz[H[y]]);
}
}
void delete_heap(){
H[1] = H[L--]; Poz[H[1]] = 1;
coboara(1);
}
int main () {
f >> N >> M;
for ( i = 1 ; i <= M ; ++i ){
f >> x >> aux.nod >> aux.cst;
A[x].push_back(aux);
}
for ( i = 2 ; i <= N ; ++i )
D[i] = INF;
++L;
H[1] = 1; Poz[H[1]] = 1;
while ( L ){
int nod = H[1];
delete_heap();
for ( i = 0 ; i < A[nod].size() ; ++i ){
int nd = A[nod][i].nod;
int cst = A[nod][i].cst;
if ( D[nod] + cst < D[nd] ){
D[nd] = D[nod] + cst;
if ( Poz[nd] ){
urca(Poz[nd]);
}
else{
++L;
H[L] = nd; Poz[H[L]] = L;
urca(L);
}
}
}
}
for ( i = 2 ; i <= N ; ++i ){
if ( D[i] == INF )
g << "0 ";
else
g << D[i] << " ";
}
f.close();
g.close();
return 0;
}