using System;
using System.Collections.Generic;
class Program
{
static void Main()
{
int[,] matrix = {
{ 1, 2, 3 },
{ 4, 5, 6 },
{ 7, 8, 7 } // This row contains a repetition
};
for (int i = 0; i < matrix.GetLength(0); i++) {
if (RowHasRepetitions(matrix, i)) {
Console.WriteLine($"Row {i} contains repetitions.");
}
else {
Console.WriteLine($"Row {i} has unique numbers.");
}
}
if (IsMatrixValid(matrix)) {
Console.WriteLine("All rows in the matrix contain unique numbers.");
}
else {
Console.WriteLine("Some rows in the matrix contain repeated numbers.");
}
}
// Checks if a specific row has repeated numbers
static bool RowHasRepetitions(int[,] matrix, int rowIndex) {
HashSet<int> seenNumbers = new HashSet<int>();
for (int j = 0; j < matrix.GetLength(1); j++) {
if (!seenNumbers.Add(matrix[rowIndex, j])) {
return true; // If Add() returns false, the number is already in the set
}
}
return false; // No repetitions found
}
// Checks if all rows in the matrix have unique numbers
static bool IsMatrixValid(int[,] matrix) {
for (int i = 0; i < matrix.GetLength(0); i++) {
if (RowHasRepetitions(matrix, i)) {
return false; // If any row contains repetitions, return false
}
}
return true; // All rows are unique
}
}
/*
run:
Row 0 has unique numbers.
Row 1 has unique numbers.
Row 2 contains repetitions.
Some rows in the matrix contain repeated numbers.
*/
