"Cheapest Flights Within K Stops solution" Code Answer's
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Cheapest Flights Within K Stops solution
Mukul Taneja
on Jun 14, 2020
public int findCheapestPrice(int n, int[][] flights, int src, int dst, int k) {
Map<Integer, Map<Integer, Integer>> prices = new HashMap<>();
for (int[] f : flights) {
if (!prices.containsKey(f[0])) prices.put(f[0], new HashMap<>());
prices.get(f[0]).put(f[1], f[2]);
}
Queue<int[]> pq = new PriorityQueue<>((a, b) -> (Integer.compare(a[0], b[0])));
pq.add(new int[] {0, src, k + 1});
while (!pq.isEmpty()) {
int[] top = pq.remove();
int price = top[0];
int city = top[1];
int stops = top[2];
if (city == dst) return price;
if (stops > 0) {
Map<Integer, Integer> adj = prices.getOrDefault(city, new HashMap<>());
for (int a : adj.keySet()) {
pq.add(new int[] {price + adj.get(a), a, stops - 1});
}
}
}
return -1;
}Source: massivealgorithms.blogspot.com
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