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Zig Zag Sequence
Zig Zag Sequence
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Here are my 3 changes in C++, should not be too difficult for other languages too
def findZigZagSequence(a, n): a.sort() mid = int((n + 1)/2) - 1 #Used as index, so -1 a[mid], a[n-1] = a[n-1], a[mid]
test_cases = int(input()) for cs in range (test_cases): n = int(input()) a = list(map(int, input().split())) findZigZagSequence(a, n) Sorting the Array:
The input array a is sorted to ensure it starts in ascending order. This is crucial for constructing the lexicographically smallest zig-zag sequence. Finding and Swapping the Middle Element:
The middle index is calculated as (n + 1) / 2 - 1, adjusted to match Python's 0-based indexing. The middle element is swapped with the last element of the array to start forming the zig-zag pattern. Reversing the Second Half:
From the element right after the middle (st = mid + 1) to the second last element (ed = n - 2), elements are swapped iteratively to reverse this section of the array. This ensures the second half is in decreasing order. Output the Result:
The final zig-zag sequence is printed. The code ensures the last element ends with a newline, while others are separated by spaces. Test Case Loop:
The program handles multiple test cases by iterating over the input and applying the transformation for each array. Key Points: Zig-Zag Definition: The first half of the array is in increasing order, and the second half is in decreasing order. Efficiency: Sorting is O(n log n), and reversing the second half is O(n), making the solution efficient. Lexicographical Order: Sorting ensures the sequence remains lexicographically smallest. This approach ensures the requirements of the problem are met concisely and effectively.
Only change 3 lines but doesn't provide all languages. So if you make a new solution from scratch, your solution always fails due to creating more than 3 lines of code.
Python 3 (comments on changed lines)
i have made my solution in c and it's workig with the exact output when debuging on codeblocks but when submitting it on the site it gives me wrong answer