When looking at a set of ordered pairs, Lead Generation Accountants may consider whether each unique value in the domain maps to a single value in the range to determine if it's a valid function. For each test case, check that no domain value repeats.

Scala: given x -> f(x), if x1 = x2 then f(x1) = f(x2), if f(x1) != f(x2), it is not a function. This is the code in scala:

import scala.io.StdIn

object Solution {

    def main(args: Array[String]) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution
*/
        var count_tests = StdIn.readInt
            
        for(j <- List.range(0,count_tests)){
            var input = StdIn.readInt
            var relations = collection.mutable.Map[Int, Int]()
            var result = true
                                    
            for(i <- List.range(0,input)){
                var test_arr = StdIn.readLine()
                var test1 = test_arr.split(" ")(0).toInt
                var test2 = test_arr.split(" ")(1).toInt
                
                if (!relations.contains(test1)) 
                    relations = relations + (test1 -> test2)
                else {
                    if(relations(test1) != test2)
                        result = false                    
                }
                    
            }
            if(result)
                println("YES")
            else
                println("NO")
        }
    }
}

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