Update usaco-784.mdx

Author: SansPapyrus683

solutions/bronze/usaco-784.mdx

@@ -102,6 +102,22 @@ public class Lifeguards {
 
 </Spoiler>
 
+<Spoiler title="Hint 1">
+
+How do you effectively store the shifts of the lifeguards in a way that you can
+see how many cover each time?
+
+</Spoiler>
+
+<Spoiler title="Hint 2">
+
+If one of the lifeguards is fired, how would you see which of the times are
+still covered?
+
+</Spoiler>
+
+<Spoiler title="Solution">
+
 ## Explanation
 
 [Official Analysis (Java)](http://www.usaco.org/current/data/sol_lifeguards_bronze_jan18.html)
@@ -226,3 +242,5 @@ print(max_time, file=open("lifeguards.out", "w"))
 
 </PySection>
 </LanguageSection>
+
+</Spoiler>