mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 13:31:07 +00:00
3815a97575
* Add all_construct dynamic programming implementation * all_construct: remove the main function * all_construct: Add type hints * all_construct: changed map to list comprehension,fix mutable default arguments * all_construct: fixed type hints * all_construct: cleaner code for initializing word_bank argument * all_construct: added an import for annotations * all_construct: added None in the argument with word_bank * all_construct: fixed a type hint * all_construct: Fixed some more type hints
59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
"""
|
|
Program to list all the ways a target string can be
|
|
constructed from the given list of substrings
|
|
"""
|
|
from __future__ import annotations
|
|
|
|
|
|
def all_construct(target: str, word_bank: list[str] | None = None) -> list[list[str]]:
|
|
"""
|
|
returns the list containing all the possible
|
|
combinations a string(target) can be constructed from
|
|
the given list of substrings(word_bank)
|
|
>>> all_construct("hello", ["he", "l", "o"])
|
|
[['he', 'l', 'l', 'o']]
|
|
>>> all_construct("purple",["purp","p","ur","le","purpl"])
|
|
[['purp', 'le'], ['p', 'ur', 'p', 'le']]
|
|
"""
|
|
|
|
word_bank = word_bank or []
|
|
# create a table
|
|
table_size: int = len(target) + 1
|
|
|
|
table: list[list[list[str]]] = []
|
|
for i in range(table_size):
|
|
table.append([])
|
|
# seed value
|
|
table[0] = [[]] # because empty string has empty combination
|
|
|
|
# iterate through the indices
|
|
for i in range(table_size):
|
|
# condition
|
|
if table[i] != []:
|
|
for word in word_bank:
|
|
# slice condition
|
|
if target[i : i + len(word)] == word:
|
|
new_combinations: list[list[str]] = [
|
|
[word] + way for way in table[i]
|
|
]
|
|
# adds the word to every combination the current position holds
|
|
# now,push that combination to the table[i+len(word)]
|
|
table[i + len(word)] += new_combinations
|
|
|
|
# combinations are in reverse order so reverse for better output
|
|
for combination in table[len(target)]:
|
|
combination.reverse()
|
|
|
|
return table[len(target)]
|
|
|
|
|
|
if __name__ == "__main__":
|
|
print(all_construct("jwajalapa", ["jwa", "j", "w", "a", "la", "lapa"]))
|
|
print(all_construct("rajamati", ["s", "raj", "amat", "raja", "ma", "i", "t"]))
|
|
print(
|
|
all_construct(
|
|
"hexagonosaurus",
|
|
["h", "ex", "hex", "ag", "ago", "ru", "auru", "rus", "go", "no", "o", "s"],
|
|
)
|
|
)
|