title: Check Whether Arithmetic Progression Can Formed Given Array
signature: bool checkWhetherArithmeticProgressionCanFormedGivenArray(vector<int> arr, int n) {
test_code: #include <algorithm>
  #include <assert.h>
  #include <cstdlib>
  #include <iostream>
  #include <map>
  #include <set>
  #include <string>
  #include <tuple> 
  #include <unordered_map>
  #include <vector>
  #include <math.h>
  #include <cmath>
  #include <bits/stdc++.h>
  #include <numeric>
  #include <functional>
  
  using namespace std;
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  bool validateSolution(bool actual, bool expected){
      return actual == expected;
  }
  
  string driver(vector<int> arr, int n, bool expected){
      try
      {
          if (validateSolution(PLACEHOLDER_FN_NAME(arr, n), expected)){
              return "PASSED";
          }
          return "FAILED";
      }
      catch (const std::overflow_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::runtime_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::exception& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (...)
      {
          return "UNK_ERROR";
      }
  }
  
  int main() {
      string result = "";
  
      result = driver({1, 4, 16, 64}, 4, false); 
      cout << "TEST-" << 0 << "..."
           <<  result
           << "\n";
  
      result = driver({0, 4, 8, 12}, 4, true); 
      cout << "TEST-" << 1 << "..."
           <<  result
           << "\n";
  
      result = driver({-2, 0, 2, 4, 6}, 5, true); 
      cout << "TEST-" << 2 << "..."
           <<  result
           << "\n";
  
      result = driver({0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 7, true); 
      cout << "TEST-" << 3 << "..."
           <<  result
           << "\n";
  
      result = driver({46, 56, 66, 76, 86}, 5, true); 
      cout << "TEST-" << 4 << "..."
           <<  result
           << "\n";
  
      result = driver({46, 56, 56, 66, 76, 86}, 6, false); 
      cout << "TEST-" << 5 << "..."
           <<  result
           << "\n";
  
      result = driver({7, 9, 11, 21, 44, 45, 61, 67, 78, 97, 98, 99}, 11, false); 
      cout << "TEST-" << 6 << "..."
           <<  result
           << "\n";
  
      result = driver({-96, -84, -74, -70, -68, -62, -50, -50, -38, -36, -36, -36, -34, -34, -28, -28, -26, -18, -12, -4, -4, -2, -2, 6, 6, 14, 24, 34, 36, 44, 50, 54, 54, 62, 64, 66, 70, 74, 74, 78, 84, 86}, 33, false); 
      cout << "TEST-" << 7 << "..."
           <<  result
           << "\n";
  
      result = driver({0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 33, false); 
      cout << "TEST-" << 8 << "..."
           <<  result
           << "\n";
  
      result = driver({1, 3, 5, 11, 14, 15, 15, 17, 18, 19, 20, 20, 22, 32, 33, 35, 36, 37, 39, 44, 45, 46, 51, 54, 57, 58, 61, 61, 63, 64, 67, 69, 70, 70, 79, 82, 86, 89, 92, 93, 95, 99}, 40, false); 
      cout << "TEST-" << 9 << "..."
           <<  result
           << "\n";
  
      return 0;
  }
source_py: def check_whether_arithmetic_progression_can_formed_given_array(arr, n):
      if (n == 1):
          return True
      arr.sort()
      d = (arr[1] - arr[0])
      for i in range(2, n):
          if ((arr[i] - arr[(i - 1)]) != d):
              return False
      return True
source_cpp: bool check_whether_arithmetic_progression_can_formed_given_array(vector<int> arr, int n) {
    if ( n == 1 ) return true;
    sort(arr.begin(), arr.end());
    int d = arr [ 1 ] - arr [ 0 ];
    for ( int i = 2;
    i < n;
    i ++ ) if ( arr [ i ] - arr [ i - 1 ] != d ) return false;
    return true;
  }