title: Cassinis Identity
signature: pub fn cassinis_identity(n: i32) -> i32 {
test_code: use std::collections::HashMap;
  use std::collections::HashSet;
  use std::cmp::*;
  use std::collections::*;
  use std::fmt::*; 
  
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  pub fn validate_solution(actual: i32, expected: i32)->bool{
  return actual==expected
  }
  pub fn driver(n: i32, expected: i32)->String{
      if validate_solution(PLACEHOLDER_FN_NAME(n), expected) {
        return "PASSED".to_string();
      };
      return "FAILED".to_string();
  
  }
  
  fn main() {
      println!("TEST-0...{}", driver(
        67, 
        -1
      ));
      
      println!("TEST-1...{}", driver(
        2, 
        1
      ));
      
      println!("TEST-2...{}", driver(
        58, 
        1
      ));
      
      println!("TEST-3...{}", driver(
        6, 
        1
      ));
      
      println!("TEST-4...{}", driver(
        42, 
        1
      ));
      
      println!("TEST-5...{}", driver(
        17, 
        -1
      ));
      
      println!("TEST-6...{}", driver(
        37, 
        -1
      ));
      
      println!("TEST-7...{}", driver(
        44, 
        1
      ));
      
      println!("TEST-8...{}", driver(
        23, 
        -1
      ));
      
      println!("TEST-9...{}", driver(
        40, 
        1
      ));
      
  }
source_py: def cassinis_identity(n):
      return ((- 1) if (n & 1) else 1)
source_cpp: int cassinis_identity(int n) {
    return ( n & 1 ) ? - 1 : 1;
  }