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Showing content from https://TheAlgorithms.github.io/C-Plus-Plus/d2/d26/count__inversions_8cpp_source.html below:

TheAlgorithms/C++: sorting/count_inversions.cpp Source File

uint32_t

(T* arr, T* temp, uint32_t left, uint32_t mid, uint32_t right) {

uint32_t inv_count = 0;

((i <= mid) && (j <= right)) {

(arr[i] <= arr[j]) {

temp[k++] = arr[i++];

temp[k++] = arr[j++];

(k = left; k <= right; k++) {

uint32_t

(T* arr, T* temp, uint32_t left, uint32_t right) {

uint32_t mid = 0, inv_count = 0;

mid = (right + left) / 2;

inv_count +=

(arr, temp, left, mid);

inv_count +=

(arr, temp, mid + 1, right);

inv_count +=

(arr, temp, left, mid, right);

temp.assign(size, 0);

(arr, temp.data(), 0, size - 1);

(T* arr,

uint32_t array_size) {

std::cout <<

;

(uint32_t i = 0; i < array_size; i++) {

std::cout <<

<< arr[i];

std::vector<uint64_t> arr1 = {

100, 99, 98, 97, 96, 95, 94, 93, 92, 91, 90, 89, 88, 87, 86, 85, 84,

83, 82, 81, 80, 79, 78, 77, 76, 75, 74, 73, 72, 71, 70, 69, 68, 67,

66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50,

49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33,

32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16,

15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1};

uint32_t size1 = arr1.size();

uint32_t inv_count1 = 4950;

assert(inv_count1 == result1);

std::vector<int> arr2 = {22, 66, 75, 23, 11, 87, 2, 44, 98, 43};

uint32_t size2 = arr2.size();

uint32_t inv_count2 = 20;

assert(inv_count2 == result2);

std::vector<double> arr3 = {33.1, 45.2, 65.4, 76.5, 1.0,

2.9, 5.4, 7.7, 88.9, 12.4};

uint32_t size3 = arr3.size();

uint32_t inv_count3 = 21;

assert(inv_count3 == result3);

std::vector<char> arr4 = {

,

,

,

,

};

uint32_t size4 = arr4.size();

uint32_t inv_count4 = 0;

assert(inv_count4 == result4);

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