From fdec1c679090b34bceb16a79c2203cf08c6346ed Mon Sep 17 00:00:00 2001
From: Sitesh Pattanaik <sitesh@dhcp-v091-088.mobile.uci.edu>
Date: Fri, 28 Oct 2022 16:37:22 -0700
Subject: [PATCH] Added 787 in Java

---
 java/787_Cheapest_Flight_Within_K_Stops.java | 41 ++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 java/787_Cheapest_Flight_Within_K_Stops.java

diff --git a/java/787_Cheapest_Flight_Within_K_Stops.java b/java/787_Cheapest_Flight_Within_K_Stops.java
new file mode 100644
index 0000000..9355cf9
--- /dev/null
+++ b/java/787_Cheapest_Flight_Within_K_Stops.java
@@ -0,0 +1,41 @@
+class Solution {
+    //using bellman ford
+    
+    public void computePrice(int[][]flights, int[] prices, int [] temp){
+        for(int[] flight: flights){
+            int u = flight[0];
+            int v = flight[1];
+            int price = flight[2];
+            
+            if(prices[u] != Integer.MAX_VALUE){
+                if(prices[u] + price < temp[v]){
+                    temp[v] = prices[u] + price;
+                }
+            }
+        }
+    }
+    
+    public void copyTempToPrice(int[] prices, int[] temp){
+        for(int i=0; i<prices.length; i++){
+            prices[i] = temp[i];
+        }
+    }
+    
+    public int findCheapestPrice(int n, int[][] flights, int src, int dst, int k) {
+        int[] prices = new int[n];
+        int[] temp = new int[n];
+        
+        Arrays.fill(prices, Integer.MAX_VALUE);
+        Arrays.fill(temp, Integer.MAX_VALUE);
+        
+        prices[src] = 0;
+        temp[src] = 0;
+        
+        for(int i=0; i<=k; i++){
+            computePrice(flights, prices, temp);
+            copyTempToPrice(prices, temp);
+        }
+        
+        return prices[dst] == Integer.MAX_VALUE ? -1 : prices[dst];
+    }
+}
\ No newline at end of file