Missing Number | Multiple Approaches | Leetcode 268
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This is the 22nd Video of our Playlist "Leetcode Easy".
We will be solving "Missing Number | Leetcode 268" using multiple approaches.
Problem Name : Power of Two | Leetcode 231
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My solutions on Github : https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/Mathematical/Missing%20Number.cpp
Leetcode Link : https://leetcode.com/problems/missing-number/
Approach Summary :
XOR Approach:
Time Complexity (T.C): O(n)
Space Complexity (S.C): O(1)
The XOR approach leverages the bitwise XOR operation to find the missing number in an array. It exploits the property that XOR of a number with itself is 0, allowing the algorithm to efficiently determine the missing number.
Math Approach:
Time Complexity (T.C): O(n)
Space Complexity (S.C): O(1)
This approach uses the sum formula for consecutive integers (n * (n + 1) / 2) to calculate the expected sum of the array elements. By subtracting the actual sum of the array from the expected sum, the missing number is identified.
Binary Search Approach:
Time Complexity (T.C): O(nlogn)
Space Complexity (S.C): O(1)
The binary search approach assumes a sorted array and utilizes binary search to find the first element where the value is greater than its index. This indicates the presence of a missing number, and the algorithm adjusts the search accordingly.
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Timelines : ⏰
00:00 - Problem Explanation
03:02 - Approach 1
04:34 - Approach 2
11:09 - Approach 3
21:33 - Coding all of them
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