1 Create a data structure that efficiently supports the stack operations (pop and push) and also return the maximum element. 2  Assume the elements are integers or reals so that you can compare them. 3  Hint: use two stacks, one to store all of the elements and a second stack to store the maximums. 4  Tag systems.
Deep-Sea Mermaid Lake Mermaids Lake mermaids, sometimes known as Freshwater mermaids, live in freshwater and are built for chamouflage and sometimes live partially on land.
Mermaidâs Purses. Mermaidâs purses are the egg cases of dogfish and skates. The parent fish attaches these egg cases to objects such as seaweeds growing on the sea bed. Empty egg cases from which the baby fish have hatched out, are often found washed up along the strand line of sandy beaches.