alright but can you tell me how to solve AtCoder Beginner's Contest 297 E
时间: 2024-06-06 11:11:27 浏览: 49
Sure, I can help you with that! AtCoder Beginner's Contest 297 E is a coding challenge, so to solve it, you will need to write a program that can solve the given problem statement. You can start by reading and understanding the problem statement, and then breaking it down into smaller sub-problems that can be solved independently. Once you have a clear understanding of the problem requirements, you can start writing your code to solve it. Good luck!
相关问题
use java to continue the question,Add a class Lender that extends User. The constructor of the Lender class takes as arguments a name and the number of books lent by the user. The Lender class does not have any instance variable. Warning: the constructor of the Lender class takes as argument the number of books lent by the lender, but the book instance variable of the User class indicates how many books the user borrowed! Lending books is the same as borrowing a negative number of books. The moreBook method of the Lender class increases the number of books lent by the lender user by the number given as argument to the method (so the books borrowed by the lender becomes more negative!) Make sure you test all the methods of your new Lender class using testLender method. Here are some tests for your new Lender class: public static void testLender() { Lender l = new Lender("Anna",5); System.out.println(l.getName() == "Anna"); System.out.println(l.getBook() == -5); l.setBook(-6); System.out.println(l.getBook() == -6); l.moreBook(2); System.out.println(l.getBook() == -8); l.moreBook(-9); System.out.println(l.getBook() == 1); } Also, do not forget to modify your Test class to test the Lender class.
Alright, here's the updated code with the Lender class:
```
public class User {
private String name;
private int book;
public User(String name) {
this.name = name;
this.book = 0;
}
public String getName() {
return name;
}
public int getBook() {
return book;
}
public void setBook(int book) {
this.book = book;
}
public void borrowBook(int num) {
book += num;
}
}
public class Lender extends User {
public Lender(String name, int numBooksLent) {
super(name);
borrowBook(-numBooksLent);
}
public void moreBook(int num) {
borrowBook(-num);
}
}
public class Test {
public static void main(String[] args) {
User u = new User("Bob");
System.out.println(u.getName() == "Bob");
System.out.println(u.getBook() == 0);
u.borrowBook(3);
System.out.println(u.getBook() == 3);
u.setBook(5);
System.out.println(u.getBook() == 5);
Lender l = new Lender("Anna", 5);
System.out.println(l.getName() == "Anna");
System.out.println(l.getBook() == -5);
l.setBook(-6);
System.out.println(l.getBook() == -6);
l.moreBook(2);
System.out.println(l.getBook() == -8);
l.moreBook(-9);
System.out.println(l.getBook() == 1);
}
}
```
In the Lender class constructor, we call the parent constructor with the `name` argument, and then immediately call `borrowBook(-numBooksLent)` to lend out the specified number of books.
The `moreBook` method simply calls `borrowBook` with a negative value to lend out more books.
In the `Test` class, we now have tests for both the `User` and `Lender` classes.
Write a program with the following requirements: 1. Use a 5x5 boolean two-dimensional array to represent the connectivity of the graphs that need to be traversed. 2. Use depth first algorithm to traverse the graph. 3. Use breadth first algorithm to traverse the graph. 4. The starting position of the traversal is chosen reasonably based on the connectivity of the graph.
Alright, I understand your requirements. Here's a Python program that satisfies your specifications:
```python
import queue
# Define the 5x5 boolean two-dimensional array to represent the connectivity of the graphs
graph = [
[False, True, False, True, False],
[True, False, True, False, True],
[False, True, False, True, False],
[True, False, True, False, True],
[False, True, False, True, False],
]
# Define the depth first traversal function
def depth_first_traversal(graph, start):
visited = [False] * len(graph)
stack = [start]
while stack:
vertex = stack.pop()
if not visited[vertex]:
print(vertex, end=" ")
visited[vertex] = True
for i in range(len(graph)):
if graph[vertex][i] and not visited[i]:
stack.append(i)
# Define the breadth first traversal function
def breadth_first_traversal(graph, start):
visited = [False] * len(graph)
q = queue.Queue()
q.put(start)
while not q.empty():
vertex = q.get()
if not visited[vertex]:
print(vertex, end=" ")
visited[vertex] = True
for i in range(len(graph)):
if graph[vertex][i] and not visited[i]:
q.put(i)
# Choose a reasonable starting position for the traversal based on the connectivity of the graph
start = 0
for i in range(len(graph)):
if sum(graph[i]) > sum(graph[start]):
start = i
# Perform depth first traversal
print("Depth First Traversal:")
depth_first_traversal(graph, start)
# Perform breadth first traversal
print("\nBreadth First Traversal:")
breadth_first_traversal(graph, start)
```
In this program, we first define the 5x5 boolean two-dimensional array `graph` to represent the connectivity of the graphs that need to be traversed. Then, we define the `depth_first_traversal` function and the `breadth_first_traversal` function to perform depth first and breadth first traversal of the graph respectively.
Next, we choose a reasonable starting position for the traversal based on the connectivity of the graph. We do this by iterating over each vertex in the graph and comparing the number of its neighbors to the number of neighbors of the current starting vertex. We choose the vertex with the highest number of neighbors as the starting position.
Finally, we call the `depth_first_traversal` function and the `breadth_first_traversal` function with the `graph` and `start` arguments to perform the traversals. The output of the program will be the sequence of vertices visited during the traversals.
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