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Find All Substrings of a Given String

Certification: Intermediate Level Accuracy: 81.82% Submissions: 11 Points: 5

Write a Python function to find all possible string substrings.

Example 1
    
  
  • Input: s = "abc"
    • 
  
  • Output: ['a', 'ab', 'abc', 'b', 'bc', 'c']
    • 
  
  • Explanation: 
      
    
    • Step 1: Start with an empty result list.
      • 
    
    • Step 2: Find all substrings starting from index 0:
      
        
        
      • Substring of length 1: 'a'
        • 
        
      • Substring of length 2: 'ab'
        • 
        
      • Substring of length 3: 'abc'
        • 
      
      
    
      • 
    
    • Step 3: Find all substrings starting from index 1:
      
        
        
      • Substring of length 1: 'b'
        • 
        
      • Substring of length 2: 'bc'
        • 
      
      
    
      • 
    
    • Step 4: Find all substrings starting from index 2:
      
        
        
      • Substring of length 1: 'c'
        • 
      
      
    
      • 
    
    • Step 5: Combine all substrings to get ['a', 'ab', 'abc', 'b', 'bc', 'c'].
      • 
  
    •
Example 2
    
  
  • Input: s = "xy"
    • 
  
  • Output: ['x', 'xy', 'y']
    • 
  
  • Explanation: 
      
    
    • Step 1: Start with an empty result list.
      • 
    
    • Step 2: Find all substrings starting from index 0:
      
        
        
      • Substring of length 1: 'x'
        • 
        
      • Substring of length 2: 'xy'
        • 
      
      
    
      • 
    
    • Step 3: Find all substrings starting from index 1:
      
        
        
      • Substring of length 1: 'y'
        • 
      
      
    
      • 
    
    • Step 4: Combine all substrings to get ['x', 'xy', 'y'].
      • 
  
    •
Constraints
    
  
  • 1 <= len(string) <= 100
    • 
  
  • Time Complexity: O(n²) where n is the length of the string
    • 
  
  • Space Complexity: O(n²)
    •
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Hint
Solution

Solution Hints

    
  
  • Use nested loops to generate all substrings: outer loop for the starting index, inner loop for the ending index.
    • 
  
  • Append each substring to a list and return the list.
    •

Steps to solve by this approach:

 Step 1: Initialize an empty list to store all substrings
 
 Step 2: Use a nested loop to generate all possible substring ranges

 Step 3: Outer loop (i) iterates through each starting position

 Step 4: Inner loop (j) iterates through each possible ending position

 Step 5: For each (i,j) pair, extract substring s[i:j] and add to list

 Step 6: Continue until all possible substrings are generated

 Step 7: Return the complete list of all substrings

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