Pagini recente » Cod sursa (job #1977357) | Cod sursa (job #1824601) | Cod sursa (job #1879601) | Cod sursa (job #719197) | Cod sursa (job #2981026)
//https://infoarena.ro/problema/dijkstra
#include <bits/stdc++.h>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
vector <pair<int, int>> neighbor[50005];
priority_queue <pair<int, int>> findMinDistance;
int distanceNode[50005];
void dijkstra(int node, int nodesNo) {
distanceNode[node] = 0;
findMinDistance.push({- distanceNode[node], node});
while (!findMinDistance.empty()) {
int currentNode = findMinDistance.top().second;
findMinDistance.pop();
for (int i = 0; i < neighbor[currentNode].size(); ++i) {
if (abs (distanceNode[neighbor[currentNode][i].second]) <= abs (distanceNode[currentNode] + neighbor[currentNode][i].first)) continue;
distanceNode[neighbor[currentNode][i].second] = abs (distanceNode[currentNode] + neighbor[currentNode][i].first);
findMinDistance.push({- distanceNode[neighbor[currentNode][i].second], neighbor[currentNode][i].second});
}
}
for (int i = 2; i <= nodesNo; ++i) {
if (distanceNode[i] == 100000000) {
distanceNode[i] = 0;
}
fout << distanceNode[i] << " ";
}
}
int main()
{
int nodesNo, edgesNo;
fin >> nodesNo >> edgesNo;
for (int i = 1; i <= nodesNo; ++i) {
distanceNode[i] = 100000000;
}
for (int i = 1; i <= edgesNo; ++i) {
int xNode, yNode, distanceXToY;
fin >> xNode >> yNode >> distanceXToY;
neighbor[xNode].push_back({distanceXToY, yNode});
}
dijkstra(1, nodesNo);
}