Pagini recente » Cod sursa (job #1713342) | Cod sursa (job #28105) | Cod sursa (job #60551) | Cod sursa (job #298225) | Cod sursa (job #2755422)
#include <bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
const int NMAX = 5 * 1e4 + 5;
#define INF (1 << 30)
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
vector<pii> adj[NMAX];
int N, M;
void dijkstra(int src, vector<int>& d) {
// {d[node], node}
set<pii> pq;
d[src] = 0;
for (auto p : adj[src]) {
int y = p.first;
int w = p.second;
pq.insert({w, y});
d[y] = w;
}
while (!pq.empty()) {
auto it = pq.begin();
auto x = (*it).second;
pq.erase(it);
for (auto p : adj[x]) {
int y = p.first;
int w = p.second;
if (d[y] > d[x] + w) {
// delete the previous entry from pq
pq.erase({d[y], y});
d[y] = d[x] + w;
pq.insert({d[y], y});
}
}
}
for (int x = 1; x <= N; ++x) {
if (d[x] == INF) {
d[x] = 0;
}
}
}
int main() {
int i, x, y, w;
fin >> N >> M;
for (i = 1; i <= M; ++i) {
fin >> x >> y >> w;
adj[x].push_back({y, w});
}
vector<int> d(N + 1, INF);
dijkstra(1, d);
for (x = 2; x <= N; ++x) {
fout << d[x] << " ";
}
fout << "\n";
return 0;
}