Pagini recente » Cod sursa (job #862184) | Cod sursa (job #377606) | Cod sursa (job #1929454) | Cod sursa (job #1427388) | Cod sursa (job #3285681)
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
const int NMAX = 50001,
INF = 1 << 29;
struct muchie {
int y, w;
muchie(int yy = 0, int ww = 0): y(yy), w(ww) {}
};
int N, M, D[NMAX];
bool InQ[NMAX];///InQ[i] = 1 <==> nodul i este in coada
class Comp { ///pt coada cu prioritate
public:
bool operator()(int a, int b) const {
return D[a]>D[b];
}
};
vector<muchie> G[NMAX];
priority_queue<int, vector<int>,Comp> Q;
void citire() {
int x,y,c;
f>>N>>M;
for(int i = 1; i <= M; i++) {
f>>x>>y>>c;
G[x].push_back(muchie(y, c));
}
}
void Dijkstra(int nod) {
int crt, cost;
D[nod] = 0;
InQ[nod] = 1;
Q.push(nod);
while(!Q.empty()) {
crt = Q.top();///Se extrage varful aflat la distanta minima fata de "nod"
Q.pop();
InQ[crt] = 0;
///Se parcurg arcele care poleaca din varful crt si se optimizeaza
///consturile drumurilor pentru varfurile care sunt extremitati finale
///ale acestor arce
for(const muchie &mm : G[crt]) {
cost=D[crt]+mm.w;
if(D[mm.y]>cost) {
D[mm.y]=cost;
if(!InQ[mm.y]) {
Q.push(mm.y);
InQ[mm.y]=1;
}
}
}
}
}
int main() {
int i;
citire();
for(i=1; i<=N; i++) {
D[i]=INF;
}
Dijkstra(1);
for(i=2; i<=N; i++) {
if(D[i]==INF) {
g<<"0 ";
} else {
g<<D[i]<<' ';
}
}
f.close();
g.close();
return 0;
}