stream solution (not optimized)

src/main/java/Solution.java

@@ -1,4 +1,5 @@
 import java.util.*;
+import java.util.stream.*;
 
 class Solution {
 	
@@ -9,16 +10,14 @@ class Solution {
 				.toArray();
 		
 		// code your solution here
-		int maxProfit = 0;
-		for ( int index = 0; index < prices.length; index++ ) {
-			var currentPrice = prices[index];
-			
-			for ( int rem = index + 1; rem < prices.length; rem++ ) {
-				var futurePrice = prices[rem];
-				var profit = futurePrice - currentPrice;
-				maxProfit = Math.max( profit, maxProfit );
-			}
-		}
+		var maxProfit = IntStream.range( 0, prices.length )
+				.map( index -> {
+					var range = Arrays.copyOfRange( prices, index, prices.length );
+					var max = IntStream.of( range ).max().orElse( 0 );
+					// difference between current price and future maximum
+					return max - prices[index];
+				})
+				.max().orElse( 0 );
 		
 		// Write result with System.out.println()
 		System.out.println( maxProfit );