Adding problem of the day

danfimov · Feb 10, 2021 · 38f3bef · 38f3bef
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diff --git a/Python Developer/HyperJob Agency/Problems/10 puppies/main.py b/Python Developer/HyperJob Agency/Problems/10 puppies/main.py
@@ -0,0 +1,8 @@
+class Puppy:
+    n_puppies = 0  # number of created puppies
+
+    def __new__(cls):
+        if cls.n_puppies <= 9:
+            cls.n_puppies += 1
+            return object.__new__(cls)
+        return None
diff --git a/Python Developer/HyperJob Agency/Problems/10 puppies/task-info.yaml b/Python Developer/HyperJob Agency/Problems/10 puppies/task-info.yaml
@@ -0,0 +1,16 @@
+type: code
+files:
+- name: main.py
+  visible: true
+  text: |-
+    class Puppy:
+        n_puppies = 0  # number of created puppies
+
+        # define __new__
+  learner_created: false
+feedback_link: https://hyperskill.org/learn/step/7145#comment
+status: Solved
+feedback:
+  message: <html>Correct solution</html>
+  time: Wed, 10 Feb 2021 08:37:54 UTC
+record: -1
diff --git a/Python Developer/HyperJob Agency/Problems/10 puppies/task-remote-info.yaml b/Python Developer/HyperJob Agency/Problems/10 puppies/task-remote-info.yaml
@@ -0,0 +1,2 @@
+id: 7145
+update_date: Fri, 01 Jan 2021 05:36:16 UTC
diff --git a/Python Developer/HyperJob Agency/Problems/10 puppies/task.html b/Python Developer/HyperJob Agency/Problems/10 puppies/task.html
@@ -0,0 +1,17 @@
+<h2>10 puppies</h2>
+<html>
+ <head></head>
+ <body>
+  <p>You want your program to work in a way that at any given time there can be <strong>no more than</strong> 10 puppies. Define <code class="java">__new__</code> method so that this restriction is placed on the class.</p> 
+  <p><button class="btn-sm btn-outline-secondary" onclick="getElementById('hint-212').style.display='inline'"> Hint </button> </p>
+  <div id="hint-212" style="display:none;">
+   Pay attention to the comparison symbols that you use. If there are already 10 puppies (10 instances of the class 
+   <code class="java">Puppy</code>), you should NOT be able to create another one!
+  </div>
+  <p></p>
+ </body>
+</html><br><br><font color="gray">Memory limit: 256 MB</font><br><font color="gray">Time limit: 15 seconds</font><br><br>
+<b>Caution</b><br><br>
+You may see errors in your code or execution results due to missing context. Don’t worry about it, just write the solution and press Check.
+<br><br>
+<a href="https://hyperskill.org/learn/step/7139">Show topic summary</a>
diff --git a/Python Developer/HyperJob Agency/Problems/A little about strings/task-remote-info.yaml b/Python Developer/HyperJob Agency/Problems/A little about strings/task-remote-info.yaml
@@ -1,2 +1,2 @@
 id: 12130
-update_date: Sat, 23 Jan 2021 10:41:11 UTC
+update_date: Wed, 10 Feb 2021 11:39:57 UTC
diff --git a/Python Developer/HyperJob Agency/Problems/A little about strings/task.html b/Python Developer/HyperJob Agency/Problems/A little about strings/task.html
@@ -4,7 +4,7 @@ <h2>A little about strings</h2>
  <body>
   <p>Often programmers face a problem that can be solved by analogy. You are already familiar with the <code class="java">string</code> data type. Now you need to study the relevant section of the <a target="_blank" href="https://docs.python.org/3/tutorial/introduction.html#strings" rel="noopener noreferrer nofollow">documentation about strings</a> to solve this problem. In the documentation you will find the necessary similar examples.</p> 
   <p>Your task is to correct the code so that the output would be the following:</p> 
-  <pre><code class="language-no-highlight">It isn`t in the section 'D:\some\name_of_file'</code></pre>
+  <pre><code class="language-no-highlight">It isn`t in the section 'C:\some\name_of_file'</code></pre>
  </body>
 </html><br><b>Sample Input:</b><br><pre><code class="language-no-highlight"></code></pre><br><b>Sample Output:</b><br><pre><code class="language-no-highlight">It isn`t in the section 'C:\some\name_of_file'</code></pre><br><br><br><font color="gray">Memory limit: 256 MB</font><br><font color="gray">Time limit: 15 seconds</font><br><br>
 <a href="https://hyperskill.org/learn/step/12125">Show topic summary</a>
diff --git a/Python Developer/HyperJob Agency/Problems/Birdbox/main.py b/Python Developer/HyperJob Agency/Problems/Birdbox/main.py
@@ -0,0 +1,15 @@
+class Animal:
+    def __init__(self, name):
+        self.name = name
+
+
+class Bird(Animal):
+    pass
+
+
+class Pigeon(Bird):
+    pass
+
+
+class Sparrow(Bird):
+    pass
diff --git a/Python Developer/HyperJob Agency/Problems/Birdbox/task-info.yaml b/Python Developer/HyperJob Agency/Problems/Birdbox/task-info.yaml
@@ -0,0 +1,12 @@
+type: code
+files:
+- name: main.py
+  visible: true
+  text: '# create you classes here'
+  learner_created: false
+feedback_link: https://hyperskill.org/learn/step/7242#comment
+status: Solved
+feedback:
+  message: <html>Correct solution</html>
+  time: Wed, 10 Feb 2021 15:07:54 UTC
+record: -1
diff --git a/Python Developer/HyperJob Agency/Problems/Birdbox/task-remote-info.yaml b/Python Developer/HyperJob Agency/Problems/Birdbox/task-remote-info.yaml
@@ -0,0 +1,2 @@
+id: 7242
+update_date: Sun, 17 Jan 2021 00:30:14 UTC
diff --git a/Python Developer/HyperJob Agency/Problems/Birdbox/task.html b/Python Developer/HyperJob Agency/Problems/Birdbox/task.html
@@ -0,0 +1,15 @@
+<h2>Birdbox</h2>
+<html>
+ <head></head>
+ <body>
+  <p>Here's a diagram representing a class hierarchy:</p> 
+  <p style="text-align: center;"><img alt="" src="https://ucarecdn.com/afa4d7b6-4f03-4c6a-9d0f-4cf2e533e297/"></p> 
+  <p>The arrow points from a child class to the parent.</p> 
+  <p>In the code below, create classes that correspond to this graph.</p> 
+  <p>You should define the <code class="java">__init__</code> method in the class <code class="java">Animal</code> with the parameter <code class="java">name</code>. In the <code class="java">__init__</code>, you should create an instance attribute <code class="java">name</code>. In other classes, you don't need to define anything.</p>
+ </body>
+</html><br><br><font color="gray">Memory limit: 256 MB</font><br><font color="gray">Time limit: 15 seconds</font><br><br>
+<b>Caution</b><br><br>
+You may see errors in your code or execution results due to missing context. Don’t worry about it, just write the solution and press Check.
+<br><br>
+<a href="https://hyperskill.org/learn/step/7235">Show topic summary</a>
diff --git a/Python Developer/HyperJob Agency/Problems/Bittersweet occasion/main.py b/Python Developer/HyperJob Agency/Problems/Bittersweet occasion/main.py
@@ -0,0 +1,8 @@
+# finish the function
+def find_the_parent(child):
+    if issubclass(child, Drinks):
+        print('Drinks')
+    elif issubclass(child, Pastry):
+        print('Pastry')
+    elif issubclass(child, Sweets):
+        print('Sweets')
diff --git a/Python Developer/HyperJob Agency/Problems/Bittersweet occasion/task-info.yaml b/Python Developer/HyperJob Agency/Problems/Bittersweet occasion/task-info.yaml
@@ -0,0 +1,15 @@
+type: code
+files:
+- name: main.py
+  visible: true
+  text: |-
+    # finish the function
+    def find_the_parent(child):
+        ...
+  learner_created: false
+feedback_link: https://hyperskill.org/learn/step/9324#comment
+status: Solved
+feedback:
+  message: <html>Correct solution</html>
+  time: Wed, 10 Feb 2021 15:12:52 UTC
+record: -1
diff --git a/Python Developer/HyperJob Agency/Problems/Bittersweet occasion/task-remote-info.yaml b/Python Developer/HyperJob Agency/Problems/Bittersweet occasion/task-remote-info.yaml
@@ -0,0 +1,2 @@
+id: 9324
+update_date: Sat, 16 Jan 2021 23:15:59 UTC
diff --git a/Python Developer/HyperJob Agency/Problems/Bittersweet occasion/task.html b/Python Developer/HyperJob Agency/Problems/Bittersweet occasion/task.html
@@ -0,0 +1,20 @@
+<h2>Bittersweet occasion</h2>
+<html>
+ <head></head>
+ <body>
+  <p>Mysterious things have happened on the Hogwarts Express! Someone enchanted a food trolley and all the goodies got mixed up on the shelves. While the trolley witch is looking for the culprit, you will place <code class="java">Drinks</code>, <code class="java">Pastry</code> and <code class="java">Sweets</code> on three respective shelves.</p> 
+  <p>These base classes have various children: for example, <code class="java">PumpkinJuice</code> inherits from <code class="java">Drinks</code>. Write a function that finds a parent class for an <strong>unknown class </strong>(not an instance of a class) stored in the variable <code class="java">child</code> and <strong>prints out</strong> the parent's name.</p> 
+  <p>Note: all these classes are already created, you don't need to do that. You only need to work with the <code class="java">child</code>.</p> 
+  <p><button class="btn-sm btn-outline-secondary" onclick="getElementById('hint-827').style.display='inline'"> Hint </button> </p>
+  <div id="hint-827" style="display:none;">
+   You can use the 
+   <code class="java">issubclass()</code> function to check if a particular class is the parent class and 
+   <code class="java">class.__name__</code> to print out the name of a class.
+  </div>
+  <p></p>
+ </body>
+</html><br><br><font color="gray">Memory limit: 256 MB</font><br><font color="gray">Time limit: 15 seconds</font><br><br>
+<b>Caution</b><br><br>
+You may see errors in your code or execution results due to missing context. Don’t worry about it, just write the solution and press Check.
+<br><br>
+<a href="https://hyperskill.org/learn/step/7235">Show topic summary</a>
diff --git a/Python Developer/HyperJob Agency/Problems/Concatenation with the separator/main.py b/Python Developer/HyperJob Agency/Problems/Concatenation with the separator/main.py
@@ -0,0 +1,2 @@
+def concat(*args, sep=' '):
+    return sep.join(args)
diff --git a/Python Developer/HyperJob Agency/Problems/Concatenation with the separator/task-info.yaml b/Python Developer/HyperJob Agency/Problems/Concatenation with the separator/task-info.yaml
@@ -0,0 +1,14 @@
+type: code
+files:
+- name: main.py
+  visible: true
+  text: |-
+    def concat():
+        pass
+  learner_created: false
+feedback_link: https://hyperskill.org/learn/step/9556#comment
+status: Solved
+feedback:
+  message: <html>Correct solution</html>
+  time: Wed, 10 Feb 2021 06:31:22 UTC
+record: -1
diff --git a/...Developer/HyperJob Agency/Problems/Concatenation with the separator/task-remote-info.yaml b/...Developer/HyperJob Agency/Problems/Concatenation with the separator/task-remote-info.yaml
@@ -0,0 +1,2 @@
+id: 9556
+update_date: Mon, 05 Oct 2020 00:42:23 UTC
diff --git a/Python Developer/HyperJob Agency/Problems/Concatenation with the separator/task.html b/Python Developer/HyperJob Agency/Problems/Concatenation with the separator/task.html
@@ -0,0 +1,21 @@
+<h2>Concatenation with the separator</h2>
+<html>
+ <head></head>
+ <body>
+  <p>Write a <code class="language-python">concat()</code> function that will take an arbitrary number of strings and combine them into one through a separator (the keyword argument <code class="language-python">sep</code>). If no separator is specified, then it should separate the strings by spaces:</p> 
+  <pre><code class="language-python">print(concat("turtle"))                # "turtle"
+print(concat("cat", "dog"))            # "cat dog"
+print(concat("a", "b", "c", sep=":"))  # "a:b:c"</code></pre> 
+  <p>You do not need to call a function, just implement it.</p> 
+  <p><button class="btn-sm btn-outline-secondary" onclick="getElementById('hint-592').style.display='inline'"> Hint </button> </p>
+  <div id="hint-592" style="display:none;">
+   Consider using 
+   <code class="language-python">sep.join(strings)</code> for concatenating arguments from your tuple.
+  </div>
+  <p></p>
+ </body>
+</html><br><br><font color="gray">Memory limit: 256 MB</font><br><font color="gray">Time limit: 15 seconds</font><br><br>
+<b>Caution</b><br><br>
+You may see errors in your code or execution results due to missing context. Don’t worry about it, just write the solution and press Check.
+<br><br>
+<a href="https://hyperskill.org/learn/step/8560">Show topic summary</a>
diff --git a/Python Developer/HyperJob Agency/Problems/Cook book/main.py b/Python Developer/HyperJob Agency/Problems/Cook book/main.py
@@ -0,0 +1,2 @@
+# call the function `special` here
+special(ingredient, **dishes)
diff --git a/Python Developer/HyperJob Agency/Problems/Cook book/task-info.yaml b/Python Developer/HyperJob Agency/Problems/Cook book/task-info.yaml
@@ -0,0 +1,12 @@
+type: code
+files:
+- name: main.py
+  visible: true
+  text: '# call the function `special` here'
+  learner_created: false
+feedback_link: https://hyperskill.org/learn/step/7253#comment
+status: Solved
+feedback:
+  message: <html>Correct solution</html>
+  time: Wed, 10 Feb 2021 07:24:29 UTC
+record: -1
diff --git a/Python Developer/HyperJob Agency/Problems/Cook book/task-remote-info.yaml b/Python Developer/HyperJob Agency/Problems/Cook book/task-remote-info.yaml
@@ -0,0 +1,2 @@
+id: 7253
+update_date: Wed, 02 Dec 2020 08:06:41 UTC
diff --git a/Python Developer/HyperJob Agency/Problems/Cook book/task.html b/Python Developer/HyperJob Agency/Problems/Cook book/task.html
@@ -0,0 +1,19 @@
+<h2>Cook book</h2>
+<html>
+ <head></head>
+ <body>
+  <p>There's a predefined function called <code class="java">special</code>, a predefined variable <code class="java">ingredient</code> that contains a string, and a predefined variable <code class="java">dishes</code> that contains a dictionary.</p> 
+  <p>The function <code class="java">special</code> accepts a string with an ingredient name, and then a number of keyword arguments. </p> 
+  <p>Call the function <code class="java">special</code> by means of the variables <code class="java">ingredient</code> and <code class="java">dishes</code>.</p> 
+  <p><button class="btn-sm btn-outline-secondary" onclick="getElementById('hint-461').style.display='inline'"> Hint </button> </p>
+  <div id="hint-461" style="display:none;">
+   Mind the order: first, positional arguments, and then the rest. You cannot pass the dictionary without unpacking. What should we do to pass on 
+   <strong>keyword </strong>arguments?
+  </div>
+  <p></p>
+ </body>
+</html><br><br><font color="gray">Memory limit: 256 MB</font><br><font color="gray">Time limit: 15 seconds</font><br><br>
+<b>Caution</b><br><br>
+You may see errors in your code or execution results due to missing context. Don’t worry about it, just write the solution and press Check.
+<br><br>
+<a href="https://hyperskill.org/learn/step/9544">Show topic summary</a>
diff --git a/Python Developer/HyperJob Agency/Problems/Jackie's Savings/main.py b/Python Developer/HyperJob Agency/Problems/Jackie's Savings/main.py
@@ -0,0 +1,5 @@
+def final_deposit_amount(*interest, amount=1000):
+    result = amount
+    for elem in interest:
+        result = result * (1 + elem / 100)
+    return round(result, 2)
diff --git a/Python Developer/HyperJob Agency/Problems/Jackie's Savings/task-info.yaml b/Python Developer/HyperJob Agency/Problems/Jackie's Savings/task-info.yaml
@@ -0,0 +1,14 @@
+type: code
+files:
+- name: main.py
+  visible: true
+  text: |-
+    def final_deposit_amount(amount=1000, interest):
+        pass
+  learner_created: false
+feedback_link: https://hyperskill.org/learn/step/9554#comment
+status: Solved
+feedback:
+  message: <html>Correct solution</html>
+  time: Wed, 10 Feb 2021 06:38:36 UTC
+record: -1
diff --git a/Python Developer/HyperJob Agency/Problems/Jackie's Savings/task-remote-info.yaml b/Python Developer/HyperJob Agency/Problems/Jackie's Savings/task-remote-info.yaml
@@ -0,0 +1,2 @@
+id: 9554
+update_date: Mon, 05 Oct 2020 00:42:23 UTC
diff --git a/Python Developer/HyperJob Agency/Problems/Jackie's Savings/task.html b/Python Developer/HyperJob Agency/Problems/Jackie's Savings/task.html
@@ -0,0 +1,21 @@
+<h2>Jackie's Savings</h2>
+<html>
+ <head></head>
+ <body>
+  <p>Jackie earned <strong>€1,000</strong> and now wants to put these savings in the bank for several months. However, he has not yet decided on the exact term for the contribution.</p> 
+  <p>Suppose that the bank that Jackie chose has offers for different amounts of time. The interest rates also change from month to month. So, let's say he decides to put money for three months, and the bank sets interest rates of <strong>5%</strong>, <strong>7%</strong> and <strong>4%</strong>. The actual algorithm will be as follows:</p> 
+  <p>Amount after the first month: €1,000 * 1.05 = €1,050<br> Amount after the second month: €1,050 * 1.07 = €1,123.5<br> Amount after the third month: €1,123.5 * 1.04 = €1,168.44</p> 
+  <p>Thus, the final amount will be equal to <strong>€1,168.44</strong>. Round the value to <strong>two decimal places</strong>!</p> 
+  <p>Your task is to <strong>correct the errors</strong> in the definition of the <code class="java">final_deposit_amount()</code> function and implement it. The function should calculate and <strong>return </strong>the amount of money that Jackie will receive at the end. Note that we use interest rates as positional arguments to the function. We also have a keyword-only argument <code class="java">amount</code>. You do not need to call a function, just implement it.</p> 
+  <p><button class="btn-sm btn-outline-secondary" onclick="getElementById('hint-1348').style.display='inline'"> Hint </button> </p>
+  <div id="hint-1348" style="display:none;">
+   Use 
+   <code class="java">round(amount, 2)</code> to get the value you need.
+  </div>
+  <p></p>
+ </body>
+</html><br><b>Sample Input:</b><br><pre><code class="language-no-highlight">5 7 4</code></pre><br><b>Sample Output:</b><br><pre><code class="language-no-highlight">1168.44</code></pre><br><br><br><font color="gray">Memory limit: 256 MB</font><br><font color="gray">Time limit: 15 seconds</font><br><br>
+<b>Caution</b><br><br>
+You may see errors in your code or execution results due to missing context. Don’t worry about it, just write the solution and press Check.
+<br><br>
+<a href="https://hyperskill.org/learn/step/8560">Show topic summary</a>
diff --git a/Python Developer/HyperJob Agency/Problems/New groups/task-remote-info.yaml b/Python Developer/HyperJob Agency/Problems/New groups/task-remote-info.yaml
@@ -1,2 +1,2 @@
 id: 11104
-update_date: Sat, 16 Jan 2021 15:21:55 UTC
+update_date: Wed, 10 Feb 2021 17:30:05 UTC
diff --git a/Python Developer/HyperJob Agency/Problems/Patients/main.py b/Python Developer/HyperJob Agency/Problems/Patients/main.py
@@ -0,0 +1,14 @@
+class Patient:
+    def __init__(self, name, last_name, age):
+        self.name = name
+        self.last_name = last_name
+        self.age = age
+
+    def __str__(self):
+        return f'{self.name} {self.last_name}. {self.age}'
+
+    def __repr__(self):
+        return f'Object of the class Patient. ' \
+               f'name: {self.name}, ' \
+               f'last_name: {self.last_name}, ' \
+               f'age: {self.age}'
diff --git a/Python Developer/HyperJob Agency/Problems/Patients/task-info.yaml b/Python Developer/HyperJob Agency/Problems/Patients/task-info.yaml
@@ -0,0 +1,19 @@
+type: code
+files:
+- name: main.py
+  visible: true
+  text: |-
+    class Patient:
+        def __init__(self, name, last_name, age):
+            self.name = name
+            self.last_name = last_name
+            self.age = age
+
+        # create methods here
+  learner_created: false
+feedback_link: https://hyperskill.org/learn/step/7146#comment
+status: Solved
+feedback:
+  message: <html>Correct solution</html>
+  time: Wed, 10 Feb 2021 08:26:35 UTC
+record: -1
diff --git a/Python Developer/HyperJob Agency/Problems/Patients/task-remote-info.yaml b/Python Developer/HyperJob Agency/Problems/Patients/task-remote-info.yaml
@@ -0,0 +1,2 @@
+id: 7146
+update_date: Fri, 01 Jan 2021 05:33:46 UTC
diff --git a/Python Developer/HyperJob Agency/Problems/Patients/task.html b/Python Developer/HyperJob Agency/Problems/Patients/task.html
@@ -0,0 +1,27 @@
+<h2>Patients</h2>
+<html>
+ <head></head>
+ <body>
+  <p>The class <code class="java">Patient</code> needs both an unambiguous representation for developers and a readable string for users. Here's how they are supposed to look:</p> 
+  <ul> 
+   <li>For developers: <strong>Object of the class Patient. name: {name}, last_name: {last_name}, age: {age}</strong></li> 
+   <li>For users: <strong>{name} {last_name}. {age}</strong></li> 
+  </ul> 
+  <p>For example, for object <code class="java">john = Patient("John", "Doe", 50)</code> these representations would respectively look like this:</p> 
+  <ul> 
+   <li><strong>Object of the class Patient. name: John, last_name: Doe, age: 50</strong></li> 
+   <li><strong>John Doe. 50</strong></li> 
+  </ul> 
+  <p>Create the necessary methods below. Pay attention to spaces and punctuation in the strings.</p> 
+  <p> <button class="btn-sm btn-outline-secondary" onclick="getElementById('hint-747').style.display='inline'"> Hint </button> </p>
+  <div id="hint-747" style="display:none;">
+   Unambiguous representation can be defined within 
+   <code class="java">__repr__</code>. 
+  </div>
+  <p></p>
+ </body>
+</html><br><br><font color="gray">Memory limit: 256 MB</font><br><font color="gray">Time limit: 15 seconds</font><br><br>
+<b>Caution</b><br><br>
+You may see errors in your code or execution results due to missing context. Don’t worry about it, just write the solution and press Check.
+<br><br>
+<a href="https://hyperskill.org/learn/step/7139">Show topic summary</a>
diff --git a/Python Developer/HyperJob Agency/Problems/Percentage/main.py b/Python Developer/HyperJob Agency/Problems/Percentage/main.py
@@ -0,0 +1,3 @@
+def get_percentage(number, ndigits=None):
+    number *= 100
+    return str(round(number, ndigits)) + '%'
diff --git a/Python Developer/HyperJob Agency/Problems/Percentage/task-info.yaml b/Python Developer/HyperJob Agency/Problems/Percentage/task-info.yaml
@@ -0,0 +1,14 @@
+type: code
+files:
+- name: main.py
+  visible: true
+  text: |-
+    def get_percentage():
+        pass
+  learner_created: false
+feedback_link: https://hyperskill.org/learn/step/9516#comment
+status: Solved
+feedback:
+  message: <html>Correct solution</html>
+  time: Wed, 10 Feb 2021 06:22:36 UTC
+record: -1
diff --git a/Python Developer/HyperJob Agency/Problems/Percentage/task-remote-info.yaml b/Python Developer/HyperJob Agency/Problems/Percentage/task-remote-info.yaml
@@ -0,0 +1,2 @@
+id: 9516
+update_date: Wed, 30 Dec 2020 02:17:25 UTC