Construct Smallest Number From DI String | Easy Approaches | Leetcode 2375 | codestorywithMIK
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Hi Everyone, this is the 59th video of our Playlist "Strings : Popular Interview Problems".
Now we will be solving a good String problem - Construct Smallest Number From DI String | Easy Approaches | Intuitive | Leetcode 2375 | codestorywithMIK
Problem Name : Construct Smallest Number From DI String | Easy Approaches | Intuitive | Leetcode 2375 | codestorywithMIK
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My solutions on Github(C++ & JAVA) - https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/strings/Construct Smallest Number From DI String.cpp
Leetcode Link : https://leetcode.com/problems/construct-smallest-number-from-di-string
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Video Summary :
Approach 1 (Brute Force):
The idea is to generate all possible permutations of numbers from 1 to (n+1) and check which one matches the given pattern. We start with the smallest lexicographical sequence and use next_permutation to iterate through all permutations until we find a valid one. This approach ensures correctness but is highly inefficient due to factorial time complexity.
Approach 2 (Using Stack Simulation):
Instead of generating permutations, we construct the result using a stack-like approach. We iterate through the pattern, pushing numbers into a temporary string (acting as a stack). Whenever we encounter an 'I' or reach the end, we pop elements from the stack to form the smallest possible number while maintaining the required order. This approach efficiently constructs the result in linear time.
✨ Timelines✨
00:00 - Introduction
00:17- Motivation
01:03 - Problem Explanation
03:41 - Thought Process Approach-1 (Brute Force)
09:03 - Time Complexity
10:22 - Coding Approach-1
14:35 - Thought Process Approach-2 (Using Stack)
31:43 - Time Complexity
33:57 - Coding Approach-2
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