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Bucket Sort using Insertion Sort

 A simple implementation of Bucket Sort, using insertion sort to sort bucket elements. 

#include <iostream>
#include <cassert>
#include <algorithm>
#include <vector>

template<class FwdIt, class compare = std::less<>>
void insertionSort(FwdIt begin, FwdIt end, compare cmp = compare{})
    for (auto it = begin; it != end; ++it)
        auto const insertion = std::upper_bound(begin, it, *it, cmp);
        std::rotate(insertion, it, std::next(it));
        assert(std::is_sorted(begin, std::next(it), cmp));
void bucketSort(float arr[], int N)
    std::vector<std::vector<float>> arrBucket(N); // Created N empty buckets
    /* Segregating array elements in different buckets*/
    for (int i = 0; i < N; ++i)
        int bucketIndx = N * arr[i];
    for (int i = 0; i < N; ++i)
        insertionSort(arrBucket[i].begin(), arrBucket[i].end()); // Sorting elements in each Buckets

    /* Concatenating all buckets in one final array */
    int index = 0;
    for (int i = 0; i < N; ++i)
        for (int j = 0; j < arrBucket[i].size(); ++j)
            arr[index++] = arrBucket[i][j];
int main()
    float arr[] = {0.68, 0.01, 0.98, 0.23, 0.34};
    bucketSort(arr, 5);
    for (int i = 0; i < 5; ++i)
        std::cout << arr[i] << " ";
    return 0;


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