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- The following piece of code incorrectly attempts to remove all even values from a stack of integers. What is wrong with the code, and how would you fix it? while (!s.isEmpty()) { int n = s.pop(); if (n % 2 != 0) { s.push(n); // put back in stack if odd } }You have a stack of n boxes, with widths w1, heights hi, and depths di. The boxescannot be rotated and can only be stacked on top of one another if each box in the stack is strictlylarger than the box above it in width, height, and depth. Implement a method to compute theheight of the tallest possible stack. The height of a stack is the sum of the heights of each box.A CapnStackSparrow is an extended stack that supports four main operations: the standard Stack operations push(x) and pop() and the following non-standard operations:• max(): returns the maximum value stored on the Stack.• ksum(k): returns the sum of the top k elements on the Stack.The zip file gives an implementation SlowSparrow that implements these operations so that push(x) and pop() each run in ?(1) time, but max() and ksum(k) run in ?(?) time. For this question, you should complete the implementation of FastSparrow that implements all four operations in ?(1) (amortized) time per operation. As part of your implementation, you may use any of the classes in the Java Collections Framework and you may use any of the source code provided with the Java version of the textbook. Don't forget to also implement the size() and iterator() methods. Think carefully about your solution before you start coding. Here are two hints:1. don't use any kind of SortedSet or SortedMap, these all require…
- For our first example of using a stack, we’ll examine a very simple task: reversing aword. When you run the program, it asks you to type in a word. When you press Enter, itdisplays the word with the letters in reverse order.A stack is used to reverse the letters. First the characters are extracted one by one fromthe input string and pushed onto the stack. Then they’re popped off the stack and displayed. Because of its last-in-first-out characteristic, the stack reverses the order of thecharacters. shows the code for the reverse.cpp program.Let a stack of N=5 elements be denoted as: S={3,7,9,2,_}What would the stack look like after the following operations?pop( )pop( )push(11)push(3)pop( )pop( )pop( ) Select one: a.S={3,7,3,11,_} b.S={3,7,11,3,_} c.S={3,_,_,_,_} d.S={11,_,_,_,_} e.S={3,7,11,_,_}The school cafeteria offers circular and square sandwiches at lunch break, referred to by numbers 0 and 1 respectively. All students stand in a queue. Each student either prefers square or circular sandwiches. The number of sandwiches in the cafeteria is equal to the number of students. You are given two integer arrays students and sandwiches where sandwiches[i] is the type of the ith sandwich in the stack (i = 0 is the top of the stack) and students[j] is the preference of the jth student in the initial queue (j = 0 is the front of the queue). Part 1: Modify the code given and make it more efficient. You can try to implement your own stack or your own Queue. Or you can use the sandwiches array as a stack without making a separate Stack class. Same with the students array. Part 2: After modifying the code, explain how it works, and why it is more efficient than the solution that you started with. (Or, if it turns out that the change you made is not more efficient, try to…
- Use a stack to reverse the words of a sentence. Keep reading words until you have a word that ends in a period, adding them onto a stack. When you have a word with a period, pop the words off and print them. Stop when there are no more words in the input. For example, you should turn the inputMary had a little lamb. Its fleece was white as snow.intoLamb little a had mary. Snow as white was fleece its.Pay attention to capitalization and the placement of the period. This is what I have so far: import java.util.Scanner;import java.util.Stack; /** Class for reversing the order of a sentence.*/public class SentenceReverser{ /** Reverses the given sentence. @param sentence Sentence to be reversed. @return Reversed sentence. */ public static String reverse(String sentence) { String reversed = ""; Scanner scanner = new Scanner(sentence); Stack<String> stack = new Stack<String>(); // put your work below // ... return…The following operations are performed on a stack:PUSH A, PUSH B, POP, PUSH C, PUSH D, POP, PUSH E, POP, POP, PUSH FWhat does the stack contain after the PUSH F?a. Fb. A B C D E Fc. A C Fd. A Fe. none of the above.You may only operate on the stacks WORK and TEMP, supporting their ADT operations of PUSH (S, X), POP (S, X), and EMPTYSTACK (S), where X is an element or variable to be pushed into or popped out of the stack and S denotes the stack itself. If necessary to complete the procedures, you may also utilise one variable.i i) I How can you determine the least element that was put into Work given n different random numbers? You may employ a single variable. ii) Given n distinct random numbers that are to be pushed into WORK, how canyou find the maximum element that was pushed into it, all the while ensuring thatthe elements stored in WORK are in their descending order with the maximumelement beginning at the bottom of stack? You are permitted to use a lone variableand a temporary stack TEMP.
- You may only operate on the stacks WORK and TEMP, supporting their ADT operations of PUSH (S, X), POP (S, X), and EMPTYSTACK (S), where X is an element or variable to be pushed into or popped out of the stack and S denotes the stack itself. If necessary to complete the procedures, you may also utilise one variable. i) How can you determine the least element that was pushed into WORK given n different random integers that are going be placed into it? You are allowed to employ a single variable. ii) How can you determine the maximum element that was put into Work, given n different random integers, while making sure that the items placed in Work are arranged in ascending order, with the maximum element starting at the bottom of the stack? You are allowed to utilise the temporary stack TEMP as well as a single variable. iii) How can you create the sorted list in the array using just stacks given an array A[1: n] of unique random numbers?Here is a calling sequence for a procedure named AddThree that adds three doublewords(assume that the STDCALL calling convention is used):push 10hpush 20hpush 30hcall AddThreeDraw a picture of the procedure’s stack frame immediately after EBP has been pushed onthe runtime stackIn each plastic container of M&Ms candy, the colors are stored in random order. Your litter brother likes only the yellow ones, so he painstakingly takes out all the candies, one by one, eats the yellow ones, and keeps the others in order, so that he can return them to the container in exactly the same order as before minus the yellow candies, of course. Write a C++ program that randomly fills the colors in the stack, then ask the user to select the color they want and simulate this process. You may use any of the stack operations defined in the Stack STL.