Python Challenges: Find different ways where £2 be made using any number of coins

Last update on May 28 2022 13:42:23 (UTC/GMT +8 hours)

Python Challenges - 1: Exercise-62 with Solution

In the United Kingdom the currency is made up of pound (£) and pence (p). There are eight coins in general circulation:
1p, 2p, 5p, 10p, 20p, 50p, £1 (100p), and £2 (200p).
It is possible to make £2 in the following way:
1×£1 + 1×50p + 2×20p + 1×5p + 1×2p + 3×1p
Write a Python program to find different ways where £2 be made using any number of coins.

Sample Solution:

Python Code:

def ways():
	t = 200
	r_ways = [1] + [0] * t
	for coin in [1, 2, 5, 10, 20, 50, 100, 200]:
		for i in range(len(r_ways) - coin):
			r_ways[i + coin] += r_ways[i]
	return str(r_ways[-1])

print(ways())

Sample Output:

Flowchart:

#Ref. https://bit.ly/3cO9Gbn

Python Code Editor:

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Previous: Write a Python program to find the sum of all the numbers that can be written as the sum of fifth powers of their digits.
Next: Write a Python program to reverse and add the numbers of the two linked lists.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

The os and os.path modules.
The __file__ constant
os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
os.path.dirname(path) (returns "the directory name of pathname path")
os.getcwd() (returns "a string representing the current working directory")
os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m