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Cod sursa(job #484983)
#include <fstream>
#include <limits>
#include <set>
#include <vector>
#include <utility>
int main()
{
std::ifstream in("dijkstra.in");
std::ofstream out("dijkstra.out");
std::vector<std::vector<unsigned short> > arcs, graph;
unsigned short nodeCount, arcCount;
in >> nodeCount >> arcCount;
graph.resize(arcCount);
arcs.resize(arcCount);
for (unsigned short i = 1; i <= arcCount; i++)
{
unsigned short sourceNode, targetNode, arcLength;
in >> sourceNode >> targetNode >> arcLength;
graph.at(sourceNode).push_back(targetNode);
arcs.at(sourceNode).push_back(arcLength);
}
std::vector<unsigned short> distances(nodeCount + 1, std::numeric_limits<unsigned short>::max());
std::set<std::pair<unsigned short, unsigned short> > targets;
targets.insert(std::make_pair(0, 1));
while (targets.size() > 0)
{
unsigned short origDist = (*targets.begin()).first;
unsigned short origNode = (*targets.begin()).second;
targets.erase(targets.begin());
for (unsigned short i = 0; i < static_cast<unsigned short>(graph.at(origNode).size()); i++)
{
unsigned short arc = arcs.at(origNode).at(i);
unsigned short node = graph.at(origNode).at(i);
if (distances.at(node) > origDist + arc)
{
distances.at(node) = origDist + arc;
targets.insert(std::make_pair(distances.at(node), node));
}
}
}
// Output the results.
for (unsigned short i = 2; i <= nodeCount; i++)
out << ((distances.at(i) == std::numeric_limits<unsigned short>::max()) ? 0 : distances.at(i)) << ' ';
}