Package g0701_0800.s0787_cheapest_flights_within_k_stops

Class Solution

java.lang.Object

g0701_0800.s0787_cheapest_flights_within_k_stops.Solution

public class Solution
extends Object

787 - Cheapest Flights Within K Stops.<p>Medium</p> <p>There are <code>n</code> cities connected by some number of flights. You are given an array <code>flights</code> where <code>flights[i] = [from_i, to_i, price_i]</code> indicates that there is a flight from city <code>from_i</code> to city <code>to_i</code> with cost <code>price_i</code>.</p> <p>You are also given three integers <code>src</code>, <code>dst</code>, and <code>k</code>, return <em><strong>the cheapest price</strong> from</em> <code>src</code> <em>to</em> <code>dst</code> <em>with at most</em> <code>k</code> <em>stops.</em> If there is no such route, return <code>-1</code>.</p> <p><strong>Example 1:</strong></p> <p><img src="https://s3-lc-upload.s3.amazonaws.com/uploads/2018/02/16/995.png" alt="" /></p> <p><strong>Input:</strong> n = 3, flights = [[0,1,100],[1,2,100],[0,2,500]], src = 0, dst = 2, k = 1</p> <p><strong>Output:</strong> 200</p> <p><strong>Explanation:</strong></p> <p>The graph is shown.</p> <p>The cheapest price from city <code>0</code> to city <code>2</code> with at most 1 stop costs 200, as marked red in the picture.</p> <p><strong>Example 2:</strong></p> <p><img src="https://s3-lc-upload.s3.amazonaws.com/uploads/2018/02/16/995.png" alt="" /></p> <p><strong>Input:</strong> n = 3, flights = [[0,1,100],[1,2,100],[0,2,500]], src = 0, dst = 2, k = 0</p> <p><strong>Output:</strong> 500</p> <p><strong>Explanation:</strong></p> <p>The graph is shown.</p> <p>The cheapest price from city <code>0</code> to city <code>2</code> with at most 0 stop costs 500, as marked blue in the picture.</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= n <= 100</code></li> <li><code>0 <= flights.length <= (n * (n - 1) / 2)</code></li> <li><code>flights[i].length == 3</code></li> <li><code>0 <= from_i, to_i < n</code></li> <li><code>from_i != to_i</code></li> <li><code>1 <= price_i <= 10⁴</code></li> <li>There will not be any multiple flights between two cities.</li> <li><code>0 <= src, dst, k < n</code></li> <li><code>src != dst</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	findCheapestPrice(int n, int[][] flights, int src, int dst, int k)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

findCheapestPrice

public int findCheapestPrice(int n,
 int[][] flights,
 int src,
 int dst,
 int k)