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Counting.cpp
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Counting.cpp
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#include <iostream>
using namespace std;
void countSort(int arr[], int n)
{
int arr1[10];
int count_arr[10];
int x = arr[0];
for (int i = 1; i < n; i++)
{
if (arr[i] > x)
x = arr[i];
}
for (int i = 0; i <= x; ++i)
{
count_arr[i] = 0;
}
for (int i = 0; i < n; i++)
{
count_arr[arr[i]]++;
}
for (int i = 1; i <= x; i++)
{
count_arr[i] += count_arr[i - 1];
}
for (int i = n - 1; i >= 0; i--)
{
arr1[count_arr[arr[i]] - 1] = arr[i];
count_arr[arr[i]]--;
}
for (int i = 0; i < n; i++)
{
arr[i] = arr1[i];
}
}
void display(int arr[], int n)
{
for (int i = 0; i < n; i++)
cout << arr[i] << " ";
cout << endl;
}
int main()
{
int arr[] = {4, 2, 2, 8, 3, 3, 1};
int n = sizeof(arr) / sizeof(arr[0]);
countSort(arr, n);
display(arr, n);
}