// CPP program to count frequencies of array items
Blockquote
#include <bits/stdc++.h>
using namespace std;
void countFreq(int arr[], int n)
{
unordered_map<int, int> mp;
// Traverse through array elements and
// count frequencies
for (int i = 0; i < n; i++)
mp[arr[i]]++;
// Traverse through map and print frequencies
for (auto x : mp)
cout << x.first << " " << x.second << endl;
}
int main()
{
int arr[] = { 10,10,10,8,3,8,5,3,3,1,1,2,2 };
int n = sizeof(arr) / sizeof(arr[0]);
countFreq(arr, n);
return 0;
}