Palindrome Partitioning
Detailed guide and Python implementation for the 'Palindrome Partitioning' problem.
1. Concept Overview
The 'Palindrome Partitioning' problem is a key challenge in the Backtracking section.
This implementation focuses on easy-level logic in Python.
We prioritize technical accuracy and code readability in our provided solutions.
2. Real-World Applications
3. Visual Intuition
Visualizing the logic flow for Palindrome Partitioning.
4. Prerequisites
5. Step-by-Step Thinking
1. Understand the problem
Read the problem statement for Palindrome Partitioning carefully.
2. Formulate brute force
Draft a simple iterative solution.
3. Identify inefficiency
Look for redundant calculations.
4. Optimize search path
Use hashing or sorting to speed up the process.
5. Final Implementation
Clean up the code for production standards.
Problem Statement
Given a string s, partition s such that every substring of the partition is a palindrome. Return all possible palindrome partitioning of s.
Implement a function partition(s: str) -> list.
- •1 <= s.length <= 16
- •s contains only lowercase English letters
Examples
"aab"
[["a","a","b"],["aa","b"]]
"a","a","b" are all palindromes. "aa" is a palindrome and "b" is a palindrome. These are the only two valid partitions.
"a"
[["a"]]
A single character is always a palindrome.
Need a Hint?
Edge Cases to Watch
- Empty input structures
- Single element inputs
- Large numerical bounds
Ready to Solve?
Open the problem in PyRun's browser-based Python editor. Your code runs fully offline — no server required.
Interview Insights & Variations
Complexity Analysis Breakdown
Why Time: Directly evaluates all possibilities.
Why Space: Uses standard local memory.
Why Time: Optimized paths reduce total operations.
Why Space: May trade memory for speed.
Optimized Solution Python Code
Optimized Solution Python Code
def partition_opt(s: str) -> list[list[str]]:
res = []
part = []
def backtrack(i):
if i >= len(s):
res.append(part[:])
return
for j in range(i, len(s)):
if is_palindrome(s, i, j):
part.append(s[i : j + 1])
backtrack(j + 1)
part.pop()
def is_palindrome(s, l, r):
while l < r:
if s[l] != s[r]: return False
l, r = l + 1, r - 1
return True
backtrack(0)
return resBrute Force Code (Spoiler Guarded)
Brute Force Code (Spoiler Guarded)
def partition_brute(s: str) -> list[list[str]]:
res = []
def is_pali(sub): return sub == sub[::-1]
def dfs(i, cur):
if i == len(s):
res.append(cur[:])
return
for j in range(i, len(s)):
if is_pali(s[i:j+1]):
cur.append(s[i:j+1])
dfs(j + 1, cur)
cur.pop()
dfs(0, [])
return resAlgorithm Pattern Checklist
When dealing with Backtracking data patterns.
Core Prerequisites
Revision Key Notes
Common Mistakes & Pitfalls
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