collatz conjecture

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function collatz(n) {
var sequence = [];
while (n > 1) {
sequence.push(n);
if (n % 2 == 0) {
n = n / 2;
} else {
n = n * 3 + 1;
}
}
sequence.push(1);
return sequence;
}

collatz(69420)

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Contributed on Mar 06 2023

Adam, the developer

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write python code to invert a dictionary. it should print a dictionary where the keys are values from the input dictionary and the values are lists of keys from the input dictionary having the same value. make sure the program handles multiple same values

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# Invert a dictionary that can have several keys mapping to the same value
# In the inverse dictionary every value is mapped to the list of its keys

D={'a':1, 'b':1, 'c':2, 'd':2, 'e':3} 
D_inv={} 
for k,v in D.items(): D_inv[v]=D_inv.get(v,[])+[k]

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Tags: dictionary d

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Contributed on Aug 09 2022

BugsBuggy

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collatz conjecture

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3

import java.util.Scanner;

public class CollatzConjecture {
    public static void main(String[] args){
        System.out.println("Enter a positive number");
        Scanner userInput = new Scanner(System.in);
        int n = userInput.nextInt();
           while (n!=1) {
               if (n % 2 == 0) {
                  n = n / 2;
               } else if (n % 2 == 1) {
                  n =3 * n + 1;
               }
           }
        System.out.println(n);
    }
}

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Contributed on Jun 12 2022

Breakable Boar

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write python code to invert a dictionary. it should print a dictionary where the keys are values from the input dictionary and the values are lists of keys from the input dictionary having the same value. make sure the program handles multiple same values

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def invert_dictionary(dictionary):
    inverted_dict = {}
    for k, v in dictionary.items():
        if v in inverted_dict:
            # handle multiple same values 
            if not type(inverted_dict[v]) == list:
                inverted_dict[v] = [inverted_dict[v]]
            inverted_dict[v].append(k)
        else:
            inverted_dict[v] = k
    
    # print(inverted_dict)
    return inverted_dict

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Tags: dictionary handles having input python where

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Contributed on Sep 26 2022

These Legumes

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collatz conjecture

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Collatzconjecure in python with matplotlib

import matplotlib.pyplot as plt

checked = 0
n = int(input("Enter a number here:"))
Xresults=[n]
i = 0
Ylevels=[checked]

while n != 1:
    if (n % 2) == 0:
        n = n / 2
        print(n)
        Xresults.append(n)
        checked += 1
        Ylevels.append(checked)
    else:
        n = n * 3 + 1
        print(n)
        Xresults.append(n)
        checked += 1
        Ylevels.append(checked)

y = Xresults
x = Ylevels

plt.plot(x, y)

plt.xlabel('Number of iterations')
plt.ylabel('Value of numbers')

plt.title('Collatz conjecture')

plt.show()

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Contributed on Mar 03 2023

Aitor Vermassen Martin

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write python code to invert a dictionary. it should print a dictionary where the keys are values from the input dictionary and the values are lists of keys from the input dictionary having the same value. make sure the program handles multiple same values

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# Python3 code to demonstrate 
# swap of key and value
   
# initializing dictionary
old_dict = {'A': 67, 'B': 23, 'C': 45, 'D': 56, 'E': 12, 'F': 69, 'G': 67, 'H': 23}
 
new_dict = dict([(value, key) for key, value in old_dict.items()])
   
# Printing original dictionary
print ("Original dictionary is : ")
print(old_dict)
 
print()
 
# Printing new dictionary after swapping keys and values
print ("Dictionary after swapping is :  ")
print("keys: values")
for i in new_dict:
    print(i, " :  ", new_dict[i])

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Contributed on Jul 22 2022

Sachin

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write python code to invert a dictionary. it should print a dictionary where the keys are values from the input dictionary and the values are lists of keys from the input dictionary having the same value. make sure the program handles multiple same values

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dic = { 'a': 1, 'b':1, 'c':2, 'd':'3' }
new_dic = {}
for key, val in dic.items():
	new_dic[val] = new_dic.get(val, []) + [key]
    
print(new_dic) # {1: ['a', 'b'], 2: ['c'], '3': ['d']}

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Tags: dictionary handles having input python typescript where

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Contributed on Oct 09 2022

Homely Hamster

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write python code to invert a dictionary. it should print a dictionary where the keys are values from the input dictionary and the values are lists of keys from the input dictionary having the same value. make sure the program handles multiple same values

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dict = {'a': 'Apple', 'b': 'Ball', 'c': 'Cat', 'd': 'Dog'}

new_dict = {}

for keys, values in dict.items():
    new_dict[values] = new_dict.get(values, []) + [keys]

print(new_dict)  # {'Apple': ['a'], 'Ball': ['b'], 'Cat': ['c'], 'Dog': ['d']}

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Contributed on Oct 11 2022

OHIOLee

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write python code to invert a dictionary. it should print a dictionary where the keys are values from the input dictionary and the values are lists of keys from the input dictionary having the same value. make sure the program handles multiple same values

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# input dictionary
d = {"a": 1, "b": 2, "c": 1, "d": 2, "e": 3}

# output dictionary
# {1: ['a', 'c'], 2: ['b', 'd'], 3: ['e']}

# write your code here
def invert_dict(d):
    # create an empty dictionary
    new_dict = {}
    # iterate over the keys and values of the input dictionary
    for key, value in d.items():
        # if the value is not in the new dictionary
        if value not in new_dict:
            # add the value as a key and the key as a value
            new_dict[value] = [key]
        # if the value is in the new dictionary
        else:
            # append the key to the value
            new_dict[value].append(key)
    # return the new dictionary
    return new_dict


# print the output
print(invert_dict(d))

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Contributed on Oct 27 2022

Nitin Rai

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write python code to invert a dictionary. it should print a dictionary where the keys are values from the input dictionary and the values are lists of keys from the input dictionary having the same value. make sure the program handles multiple same values

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def invert_dictionary(d):
  inverted_dict = {}
  for key, value in d.items():
    if value in inverted_dict:
      inverted_dict[value].append(key)
    else:
      inverted_dict[value] = [key]
  return inverted_dict

# Test the function
original_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 1, 'e': 2}
print(invert_dictionary(original_dict))
# {1: ['a', 'd'], 2: ['b', 'e'], 3: ['c']}

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Contributed on Jan 10 2023

Muiz Ather

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write python code to invert a dictionary. it should print a dictionary where the keys are values from the input dictionary and the values are lists of keys from the input dictionary having the same value. make sure the program handles multiple same values

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def invert(yourdict):
    keys = list(yourdict)
    values = []
    newdict = {}
    for a in keys:
        values.append(yourdict[a])
    for a in range(len(keys)):
        newdict[values[a]] = keys[a]
    return newdict

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Contributed on Jan 13 2023

Tygogotbaned.LMAO

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collatz conjecture

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collatz conjecture

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collatz conjecture

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write python code to invert a dictionary. it should print a dictionary where the keys are values from the input dictionary and the values are lists of keys from the input dictionary having the same value. make sure the program handles multiple same values

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