g1501_1600.s1514_path_with_maximum_probability.Solution Maven / Gradle / Ivy
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Java-based LeetCode algorithm problem solutions, regularly updated
package g1501_1600.s1514_path_with_maximum_probability;
// #Medium #Heap_Priority_Queue #Graph #Shortest_Path
// #2022_04_09_Time_31_ms_(93.10%)_Space_51.7_MB_(98.80%)
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.List;
import java.util.Queue;
@SuppressWarnings("unchecked")
public class Solution {
public double maxProbability(int n, int[][] edges, double[] succProb, int start, int end) {
List[] nodeToNodesList = new List[n];
List[] nodeToProbabilitiesList = new List[n];
for (int i = 0; i < n; i++) {
nodeToNodesList[i] = new ArrayList<>();
nodeToProbabilitiesList[i] = new ArrayList<>();
}
for (int i = 0; i < edges.length; i++) {
int u = edges[i][0];
int v = edges[i][1];
double w = succProb[i];
nodeToNodesList[u].add(v);
nodeToProbabilitiesList[u].add(w);
nodeToNodesList[v].add(u);
nodeToProbabilitiesList[v].add(w);
}
double[] probabilities = new double[n];
probabilities[start] = 1.0;
boolean[] visited = new boolean[n];
Queue queue = new ArrayDeque<>();
queue.add(start);
visited[start] = true;
while (!queue.isEmpty()) {
int u = queue.poll();
visited[u] = false;
for (int i = 0; i < nodeToNodesList[u].size(); i++) {
int v = nodeToNodesList[u].get(i);
double w = nodeToProbabilitiesList[u].get(i);
if (probabilities[u] * w > probabilities[v]) {
probabilities[v] = probabilities[u] * w;
if (!visited[v]) {
visited[v] = true;
queue.add(v);
}
}
}
}
return probabilities[end];
}
}