Pagini recente » Cod sursa (job #1324826) | Cod sursa (job #1459008) | Cod sursa (job #568812) | Cod sursa (job #862572) | Cod sursa (job #1509415)
#include <fstream>
#include <set>
#include <algorithm>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
struct Pair {
int dist, nod;
bool operator < (const Pair& p) const
{
return dist > p.dist;
}
};
using VI = vector<int>;
using VVI = vector<VI>;
using PII = pair<int, int>;
const int Inf = 0x3f3f3f3f;
VI d; // sirul distantelor minime
int n, m;
vector<vector<PII>> G;
void Read();
void Dijkstra(VI& d, int S);
void Write();
int main()
{
Read();
Dijkstra(d, 1);
Write();
fin.close();
fout.close();
}
void Dijkstra(VI& d, int S)
{
priority_queue<Pair> Q;
d = VI(n + 1, Inf);
d[S] = 0;
Q.push({0, S});
int x, dx, y, w;
while ( !Q.empty() )
{
x = Q.top().nod;
dx = Q.top().dist;
Q.pop();
if ( d[x] < dx )
continue;
for (const auto& e : G[x])
{
y = e.first; w = e.second;
if ( d[y] > d[x] + w )
{
d[y] = d[x] + w;
Q.push({d[y], y});
}
}
}
}
void Read()
{
fin >> n >> m;
G = vector<vector<PII>>(n + 1);
for (int i = 1, x, y, w; i <= m; ++i)
{
fin >> x >> y >> w;
G[x].push_back({y, w});
}
}
void Write()
{
for (int i = 2; i <= n; ++i)
if ( d[i] < Inf )
fout << d[i] << ' ';
else
fout << 0 << ' ';
}