Question:

How to Reverse array in groups? C++

Summary:

The code defines a C++ class Solution with a member function reverseInGroups that takes a vector of long long integers, its size, and an integer k. The function reverses every sub-array group of size k in the given vector. It uses the reverse function from the C++ Standard Template Library (STL) to reverse each sub-array. The main loop iterates through the vector in steps of k, and for each iteration, it reverses a sub-array of size k, handling the case where the last sub-array may have fewer than k elements.

Solution:

//User function template for C++

class Solution{

public:

//Function to reverse every sub-array group of size k.

void swap(int *a, int *b) {

int temp = *a;

*a = *b;

*b = temp;

}

// void rev(int arr[],int n){

// low = 0; high = n-1;

// if(low<high){

// swap(arr[low],arr[high]);

// low++;

// high--;

// }

void reverseInGroups(vector<long long>& arr, int n, int k){

for(int i = 0 ; i < n ; i+=k){

if(i+k < n){

reverse(arr.begin()+i,arr.begin()+(i+k));

}

else{

reverse(arr.begin()+i,arr.end());

}

};

Code Explanation:

The class Solution contains a member function reverseInGroups that takes a vector (arr), its size (n), and an integer (k).
The function uses a loop to iterate through the vector in steps of size k.
Inside the loop, it checks whether there are at least k elements remaining in the vector starting from the current position. If yes, it reverses a sub-array of size k using the reverse function from the STL.
If there are fewer than k elements remaining, it reverses the remaining sub-array.
The reverse function is applied to sub-arrays, effectively reversing the order of elements within each group of size k.
The function performs these operations until the entire vector is traversed.

Note: The commented-out code (// void rev(int arr[],int n) {...}) appears to be an attempt at a different approach for array reversal, but it is currently commented out and not used in the final implementation.

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