Count occurrences of the average of array elements with a given number

Given an array of integers and an integer . For every integer of the array a[i], the task is to calculate the count of numbers in the array with value equals to the average of element a[i] and x. That is, the number of occurrences of the (average of element a[i] and x) in the array.

Examples:

Input: arr[] = {2, 0, 4, 6, 2}, x = 2
Output: 2 0 0 1 2
For x = 2, the average values for 2, 0, 4, 6, 2 would be 2, 1, 3, 4, 2 respectively. So, the count array would result in 2, 0, 0, 1, 2.

Input: arr[] = {9, 5, 2, 4, 0, 3}, x = 3
Output: 0 1 1 1 0 1
For x = 3, the average values for 9, 5, 2, 4, 0, 3 would be 6, 4, 2, 3, 1, 2 respectively. So, the count array would result in 0, 1, 1, 1, 0, 1.

Recommended: Please solve it on “PRACTICE ” first, before moving on to the solution.

Approach:

1. Traverse the array and map every element with its count of occurrence in the array.
2. Now traverse the array again, take the average of the array element and given and check for its value in the map.

Below is the implementation of the above approach:

C++

 `// CPP program to find the count of ` `// occurrences of the average of array ` `// elements with a given number ` `#include ` ` `  `using` `namespace` `std; ` ` `  ` `  `    ``// Function to find the count of ` `    ``// occurrences of the average of array ` `    ``// elements with a given number ` `    ``void` `getAverageCountArray(``int` `a[], ``int` `x, ``int` `N) ` `    ``{ ` `        ``// mp to store count of occurrence ` `        ``// of every array element in the array ` `        ``map<``int``,``int``> mp; ` ` `  `        ``// Array that stores the average ` `        ``// count for given array ` `        ``int` `avg[N] = {0}; ` `        ``int` `val, av; ` ` `  `        ``for` `(``int` `i = 0; i < N; i++)  ` `        ``{ ` `            ``// first occurrence of a[i] ` `            ``if` `(mp[a[i]] == 0) ` `                ``mp[a[i]] = 1; ` `             `  `            ``else` `            ``mp[a[i]]++; ` `             `  ` `  `            ``// element has already occurred before ` `            ``// so increase its count ` `        ``} ` ` `  `        ``for` `(``int` `i = 0; i < N; i++)  ` `        ``{ ` `            ``av = ``int``((a[i] + x) / 2); ` `            ``if` `(mp.find(av) != mp.end()) ` `            ``{ ` `                ``val = mp[av]; ` `                ``avg[i] = val; ` `            ``} ` `        ``} ` ` `  `        ``// Printing the average count array ` `        ``for` `(``int` `i = 0; i < N; i++)  ` `        ``{ ` `            ``cout << avg[i] << ``" "``; ` `        ``} ` `    ``} ` ` `  `    ``// Driver code ` `    ``int` `main() ` `    ``{ ` `        ``int` `a[] = { 2, 0, 4, 6, 2 }; ` `        ``int` `x = 2; ` ` `  `        ``int` `N = ``sizeof``(a)/``sizeof``(a[0]); ` `        ``getAverageCountArray(a, x, N); ` `    ``} ` ` `  `// This code is contributed by ` `// Surendra_Gangwar `

Java

 `// Java program to find the count of ` `// occurrences of the average of array ` `// elements with a given number ` `import` `java.io.*; ` `import` `java.util.*; ` `import` `java.lang.*; ` ` `  `class` `GFG { ` ` `  `    ``// Function to find the count of ` `    ``// occurrences of the average of array ` `    ``// elements with a given number ` `    ``static` `void` `getAverageCountArray(``int``[] a, ``int` `x, ``int` `N) ` `    ``{ ` `        ``// Map to store count of occurrence ` `        ``// of every array element in the array ` `        ``HashMap map = ``new` `HashMap(); ` ` `  `        ``// Array that stores the average ` `        ``// count for given array ` `        ``int``[] avg = ``new` `int``[N]; ` `        ``int` `val, av; ` ` `  `        ``for` `(``int` `i = ``0``; i < N; i++) { ` `            ``// first occurrence of a[i] ` `            ``if` `(!map.containsKey(a[i])) { ` `                ``map.put(a[i], ``1``); ` `            ``} ` ` `  `            ``// element has already occurred before ` `            ``// so increase its count ` `            ``else` `{ ` `                ``// gives current count of a[i] ` `                ``val = map.get(a[i]); ` `                ``val++; ` `                ``map.remove(a[i]); ` `                ``map.put(a[i], val); ` `            ``} ` `        ``} ` ` `  `        ``for` `(``int` `i = ``0``; i < N; i++) { ` `            ``av = (a[i] + x) / ``2``; ` `            ``if` `(map.containsKey(av)) { ` `                ``val = map.get(av); ` `                ``avg[i] = val; ` `            ``} ` `        ``} ` ` `  `        ``// Printing the average count array ` `        ``for` `(``int` `i = ``0``; i < N; i++) { ` `            ``System.out.print(avg[i] + ``" "``); ` `        ``} ` `    ``} ` ` `  `    ``// Driver code ` `    ``public` `static` `void` `main(String args[]) ` `    ``{ ` `        ``int``[] a = { ``2``, ``0``, ``4``, ``6``, ``2` `}; ` `        ``int` `x = ``2``; ` ` `  `        ``int` `N = a.length; ` ` `  `        ``getAverageCountArray(a, x, N); ` `    ``} ` `} `

Python3

 `# Python3 program to find the count of  ` `# occurrences of the average of array  ` `# elements with a given number  ` ` `  `# Function to find the count of  ` `# occurrences of the average of array  ` `# elements with a given number  ` `def` `getAverageCountArray(a, x, N):  ` `      `  `    ``# Dictionary to store count of occurrence  ` `    ``# of every array element in the array  ` `    ``map` `=` `{} ` `     `  `    ``# Array that stores the average  ` `    ``# count for given array  ` `    ``avg ``=` `[``0``] ``*` `N  ` `   `  `    ``for` `i ``in` `range``(N):   ` `        ``# first occurrence of a[i]  ` `        ``if` `a[i] ``not` `in` `map``:   ` `            ``map``[a[i]] ``=`  `1`  `              `  `        ``# element has already occurred before  ` `        ``# so increase its count  ` `        ``else``:  ` `            ``# gives current count of a[i]  ` `            ``map``[a[i]] ``+``=` `1` `             `  `    ``for` `i ``in` `range``(N):   ` `        ``av ``=` `(a[i] ``+` `x) ``/``/` `2`  `         `  `        ``if` `av ``in` `map``: ` `            ``val ``=` `map``[av]  ` `            ``avg[i] ``=` `val  ` `              `  `    ``# Printing the average count array  ` `    ``for` `i ``in` `range``(N): ` `        ``print``(avg[i], end ``=` `" "``)  ` `          `  `      `  `if` `__name__ ``=``=` `"__main__"``: ` `      `  `    ``a ``=` `[``2``, ``0``, ``4``, ``6``, ``2``]   ` `    ``x ``=` `2`  `   `  `    ``N ``=` `len``(a)  ` `    ``getAverageCountArray(a, x, N)  ` `     `  `# This code is contributed by Rituraj Jain `

C#

 `// C# program to find the count of ` `// occurrences of the average of array ` `// elements with a given number ` `using` `System; ` `using` `System.Collections.Generic; ` ` `  `class` `GFG  ` `{ ` ` `  `// Function to find the count of ` `// occurrences of the average of array ` `// elements with a given number ` `static` `void` `getAverageCountArray(``int``[] a, ``int` `x,  ` `                                          ``int` `N) ` `{ ` `    ``// Map to store count of occurrence ` `    ``// of every array element in the array ` `    ``Dictionary<``int``,  ` `               ``int``> map = ``new` `Dictionary<``int``,  ` `                                         ``int``>(); ` ` `  `    ``// Array that stores the average ` `    ``// count for given array ` `    ``int``[] avg = ``new` `int``[N]; ` `    ``int` `val, av; ` ` `  `    ``for` `(``int` `i = 0; i < N; i++)  ` `    ``{ ` `        ``// first occurrence of a[i] ` `        ``if` `(!map.ContainsKey(a[i]))  ` `        ``{ ` `            ``map.Add(a[i], 1); ` `        ``} ` ` `  `        ``// element has already occurred before ` `        ``// so increase its count ` `        ``else`  `        ``{ ` `            ``// gives current count of a[i] ` `            ``val = map[a[i]]; ` `            ``val++; ` `            ``map.Remove(a[i]); ` `            ``map.Add(a[i], val); ` `        ``} ` `    ``} ` ` `  `    ``for` `(``int` `i = 0; i < N; i++) ` `    ``{ ` `        ``av = (a[i] + x) / 2; ` `        ``if` `(map.ContainsKey(av))  ` `        ``{ ` `            ``val = map[av]; ` `            ``avg[i] = val; ` `        ``} ` `    ``} ` ` `  `    ``// Printing the average count array ` `    ``for` `(``int` `i = 0; i < N; i++) ` `    ``{ ` `        ``Console.Write(avg[i] + ``" "``); ` `    ``} ` `} ` ` `  `// Driver code ` `public` `static` `void` `Main() ` `{ ` `    ``int``[] a = { 2, 0, 4, 6, 2 }; ` `    ``int` `x = 2; ` ` `  `    ``int` `N = a.Length; ` ` `  `    ``getAverageCountArray(a, x, N); ` `} ` `} ` ` `  `// This code is contributed by 29AjayKumar `

Output:

```2 0 0 1 2
```

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