Pagini recente » Cod sursa (job #1941745) | Cod sursa (job #1682833) | Cod sursa (job #161868) | Autentificare | Cod sursa (job #1567017)
#include <fstream>
#include <vector>
#include <set>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
const int INF = 0x3f3f3f3f;
int n, m;
vector<vector<pair<int, int>>> G;
vector<int> d;
void Read();
void Dijkstra();
void Write();
int main() {
Read();
Dijkstra();
Write();
fin.close();
fout.close();
return 0;
}
void Dijkstra() {
set<pair<int, int>> S;
d[1] = 0;
S.insert({0, 1});
int x, dx, y, dxy;
while (!S.empty()) {
x = S.begin()->second;
dx = S.begin()->first;
S.erase(S.begin());
for (auto e : G[x]) {
y = e.first; dxy = e.second;
if (d[y] > d[x] + dxy) {
d[y] = d[x] + dxy;
S.insert({d[y], y});
}
}
}
}
void Write() {
for (int i = 2; i <= n; i++)
if (d[i] == INF) fout << "0 ";
else fout << d[i] << ' ';
}
void Read() {
fin >> n >> m;
G = vector<vector<pair<int, int>>>(n + 1);
d = vector<int>(n + 1, INF);
for (int i = 1, x, y, w; i <= m; i++) {
fin >> x >> y >> w;
G[x].push_back({y, w});
}
}