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Solution.java
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Solution.java
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package hackrank.algorithm.greedy.grid;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
/**
* Grid Challenge
*
* @see https://www.hackerrank.com/challenges/grid-challenge
*/
public class Solution {
public static void main(String[] args) {
for (Grid grid : readInput(System.in)) {
System.out.println((isColumnRowSortPossible(grid) ? "YES" : "NO"));
}
}
public static boolean isColumnRowSortPossible(Grid grid) {
for (char[] row : grid.matrix) {
Arrays.sort(row);
}
for (int columnIndex = 0; columnIndex < grid.size(); columnIndex++) {
if (!grid.isColumnSorted(columnIndex)) {
return false;
}
}
return true;
}
public static List<Grid> readInput(InputStream input) {
Scanner scanner = new Scanner(input);
int numberTests = scanner.nextInt();
List<Grid> grids = new ArrayList<>();
for (int t = 0; t < numberTests; t++) {
int size = scanner.nextInt();
char[][] matrix = new char[size][];
for (int i = 0; i < size; i++) {
matrix[i] = scanner.next().toCharArray();
}
grids.add(new Grid(matrix));
}
scanner.close();
return grids;
}
}
class Grid {
char[][] matrix;
Grid(char[][] matrix) {
this.matrix = matrix;
}
public int size() {
return matrix.length;
}
public boolean isColumnSorted(int columnIndex) {
for (int rowIndex = 1; rowIndex < matrix.length; rowIndex++) {
char prev = matrix[rowIndex - 1][columnIndex];
char current = matrix[rowIndex][columnIndex];
if (prev > current) {
return false;
}
}
return true;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("Grid " + this.matrix.length + "x" + this.matrix.length + ":" + System.lineSeparator());
for (char[] row : matrix) {
sb.append("\t");
for (char c : row) {
sb.append(c + " ");
}
sb.append(System.lineSeparator());
}
return sb.toString();
}
}