Pagini recente » Cod sursa (job #2129745) | Cod sursa (job #1267821) | Cod sursa (job #3142768)
#include <iostream>
#include <set>
#include <vector>
#include <map>
#include <fstream>
using namespace std;
ifstream fin ("dijkstra.in");
ofstream fout ("dijkstra.out");
map <int, int> fr;
set <pair<int, int>> d;
vector <pair <int, int>> v[50001];
int n, m;
int c[50001];
void Dijkstra() {
while (!d.empty()) {
pair<int, int> nod = *d.begin();
d.erase(d.begin());
for (auto vecin : v[nod.second])
if (c[vecin.first] == -1) {
d.insert({nod.first + vecin.second, vecin.first});
c[vecin.first] = nod.first + vecin.second;
} else if (nod.first + vecin.second < c[vecin.first]) {
d.erase({c[vecin.first], vecin.first});
c[vecin.first] = nod.first + vecin.second;
d.insert({nod.first + vecin.second, vecin.first});
}
}
}
int main() {
fin >> n >> m;
for (int i = 1; i <= m; i ++) {
int a, b, c;
fin >> a >> b >> c;
v[a].push_back({b, c});
}
for (int i = 0; i <= n; i ++)
c[i] = -1;
int s = 1;
c[s] = 0;
d.insert({0, s});
fr[s] = 1;
Dijkstra();
for (int i = 2; i <= n; i ++)
if (c[i] != -1)
fout << c[i] << " ";
else
fout << 0 << " ";
return 0;
}