Pagini recente » Cod sursa (job #1307618) | Cod sursa (job #965854) | Cod sursa (job #234320) | Monitorul de evaluare | Cod sursa (job #3271432)
#include <iostream>
#include <fstream>
#include <vector>
#include <list>
#include <queue>
#include <limits>
using namespace std;
void dijkstra(int startNode, vector<vector<pair<int, int>>> &costMatrix, vector<bool> &visited, vector<int> &answer, vector<int> &predecessor)
{
priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> nodes;
nodes.push(pair<int, int>(0, startNode));
while (!nodes.empty())
{
pair<int, int> node = nodes.top();
nodes.pop();
for (auto it = costMatrix[node.second].begin(); it != costMatrix[node.second].end(); it++)
if (!visited[it->first])
{
answer[it->first] = min(answer[it->first], answer[node.second] + it->second);
predecessor[it->first] = node.second;
nodes.push(pair<int, int>(answer[it->first], it->first));
}
visited[node.second] = true;
}
}
int main()
{
ifstream in("dijkstra.in");
ofstream out("dijkstra.out");
int nodeCount, vertexCount, source, destination, cost;
in >> nodeCount >> vertexCount;
vector<vector<pair<int, int>>> costMatrix(nodeCount + 1);
vector<bool> visited(nodeCount + 1, false);
vector<int> answer(nodeCount + 1, numeric_limits<int>::max()), predecessor(nodeCount + 1, 0);
for (int vertexIndex = 1; vertexIndex <= vertexCount; vertexIndex++)
{
in >> source >> destination >> cost;
costMatrix[source].push_back(pair<int, int>(destination, cost));
}
answer[1] = 0;
dijkstra(1, costMatrix, visited, answer, predecessor);
for (int nodeIndex = 2; nodeIndex < answer.size(); nodeIndex++)
out << ((answer[nodeIndex] == numeric_limits<int>::max()) ? 0 : answer[nodeIndex]) << ' ';
return 0;
}