Pagini recente » Cod sursa (job #1077512) | Cod sursa (job #2184452) | Cod sursa (job #2324722) | Cod sursa (job #1120102) | Cod sursa (job #2377713)
#include <iostream>
#include <fstream>
#include <vector>
#include <set>
#define MAXN 50002
#define INF 0x3f3f3f3f
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
int n, m, D[MAXN];
vector < pair <int, int> > G[MAXN];
void citire () {
fin >> n >> m;
for (int i = 0; i < m; ++i) {
int x, y, w;
fin >> x >> y >> w;
G[x].push_back(make_pair(w, y));
}
}
void initDist () {
for (int i = 1; i <= n; ++i) {
D[i] = INF;
}
}
void Dijkstra (int nod) {
D[nod] = 0;
set < pair <int, int> > S;
S.insert(make_pair(0, nod));
while (!S.empty()) {
int x = S.begin()->second;
S.erase(S.begin());
int size = G[x].size();
for (int i = 0; i < size; ++i) {
int y = G[x][i].second;
int w = G[x][i].first;
if (D[y] > D[x] + w) {
if (D[y] != INF)
S.erase(S.find(make_pair(D[y], y)));
D[y] = D[x] + w;
S.insert(make_pair(D[y], y));
}
}
}
for (int i = 2; i <= n; ++i) {
if (D[i] != INF)
fout << D[i] << " ";
else
fout << 0 << " ";
}
}
int main () {
citire();
initDist();
Dijkstra(1);
}