Added Some Problem Solution on 2D-Array in Java

ExitPointOfMatrix.java

@@ -0,0 +1,89 @@
+import java.util.Scanner;
+
+public class ExitPointOfMatrix {
+
+	public static void Display(int [][] a)
+	{
+		for (int i = 0; i < a.length; i++) {
+			for (int j = 0; j < a[0].length; j++) {
+
+				System.out.print(a[i][j]+" "); 
+
+			}
+			System.out.println();
+		}
+	}
+
+	public static void main(String[] args) {
+
+		Scanner scn = new Scanner(System.in);
+
+		int row = scn.nextInt();
+		int coloumn = scn.nextInt();
+
+		int [][] matrix = new int[row][coloumn]; 
+
+		for (int i = 0; i < matrix.length; i++) {
+			for (int j = 0; j < matrix[0].length; j++) {
+
+				matrix[i][j] = scn.nextInt(); 
+
+			}
+		}
+
+//		Display(matrix);
+
+		int i = 0 , j = 0 , dir = 0;
+
+
+		while(true)
+		{
+
+			dir = (dir + matrix[i][j]) % 4;
+
+			if(dir == 0)
+			{
+				j++;
+			}
+			else if(dir == 1)
+			{
+				i++;
+			}
+			else if(dir == 2)
+			{
+				j--;
+			}
+			else if(dir == 3)
+			{
+				i--;
+			}
+
+			if(i < 0)
+			{
+				i++;
+				break;
+			}
+			else if(j < 0)
+			{
+				j++;
+				break;
+			}
+			else if(i == matrix.length)
+			{
+				i--;
+				break;
+			}
+			else if(j == matrix[0].length)
+			{
+				j--;
+				break;
+			}
+
+		}
+
+		System.out.println(i);
+		System.out.println(j);
+
+	}
+
+}

MatrixMultiplication.java

@@ -0,0 +1,72 @@
+import java.util.Scanner;
+
+public class MatrixMultiplication {
+
+	public static void Display(int [][] a)
+	{
+		for (int i = 0; i < a.length; i++) {
+			for (int j = 0; j < a[0].length; j++) {
+
+				System.out.print(a[i][j]+" "); 
+
+			}
+			System.out.println();
+		}
+	}
+
+public static void main(String[] args) {
+
+
+
+		Scanner scn = new Scanner(System.in);
+
+		int r1 = scn.nextInt();
+		int c1 = scn.nextInt();
+
+		int [][] oneArray = new int[r1][c1]; 
+
+		for (int i = 0; i < oneArray.length; i++) {
+			for (int j = 0; j < oneArray[0].length; j++) {
+
+				oneArray[i][j] = scn.nextInt(); 
+
+			}
+		}
+
+		int r2 = scn.nextInt();
+		int c2 = scn.nextInt();
+
+		int [][] twoArray = new int[r2][c2]; 
+
+		for (int i = 0; i < twoArray.length; i++) {
+			for (int j = 0; j < twoArray[0].length; j++) {
+
+				twoArray[i][j] = scn.nextInt(); 
+
+			}
+		}
+
+		if(c1 != r2)
+		{
+			System.out.println("Invalid input");
+			return;
+		}
+
+		int [][] prdArray = new int[r1][c2]; 
+
+		for (int i = 0; i < prdArray.length; i++) {
+			for (int j = 0; j < prdArray[0].length; j++) {
+
+				for(int k = 0; k<c1 ; k++)
+				{
+					prdArray[i][j] = prdArray[i][j] + oneArray[i][k] * twoArray[k][j];
+				}
+
+			}
+		}
+
+		Display(prdArray);
+
+}
+
+}

RotateBy90Degree.java

@@ -0,0 +1,72 @@
+import java.util.Scanner;
+
+public class RotateBy90Degree {
+
+	public static void Display(int [][] a)
+	{
+		for (int i = 0; i < a.length; i++) {
+			for (int j = 0; j < a[0].length; j++) {
+
+				System.out.print(a[i][j]+" "); 
+
+			}
+			System.out.println();
+		}
+	}
+
+	public static void main(String[] args) {
+
+		Scanner scn = new Scanner(System.in);
+
+		int size = scn.nextInt();
+
+
+		int [][] image = new int[size][size]; 
+
+		for (int i = 0; i < image.length; i++) {
+			for (int j = 0; j < image[0].length; j++) {
+
+				image[i][j] = scn.nextInt(); 
+
+			}
+		}
+
+//		Display(image);
+
+
+		// Transpose Of A Image
+
+		for (int i = 0; i < image.length; i++) {
+			for (int j = i; j < image[0].length; j++) {
+
+				int temp = image[i][j];
+				image[i][j] = image[j][i];
+				image[j][i] = temp;
+
+			}
+		}
+
+//		System.out.println();
+//		Display(image);
+
+		for (int i = 0; i < image.length; i++) {
+
+			int li = 0;
+			int ri = image.length-1;
+
+			while(li < ri)
+			{
+				int temp = image[i][li];
+				image[i][li] = image[i][ri];
+				image[i][ri] = temp;
+
+				li++;
+				ri--;
+			}
+		}
+//		System.out.println();
+//		Display(image);
+	}
+
+}
+

SPIRALDISPLAY.java

@@ -0,0 +1,109 @@
+import java.util.Scanner;
+
+public class SPIRALDISPLAY {
+
+	public static void Display(int [][] a)
+	{
+		for (int i = 0; i < a.length; i++) {
+			for (int j = 0; j < a[0].length; j++) {
+
+				System.out.print(a[i][j]+" "); 
+
+			}
+			System.out.println();
+		}
+	}
+
+	public static void main(String[] args) {
+
+		Scanner scn = new Scanner(System.in);
+
+		int row = scn.nextInt();
+		int coloumn = scn.nextInt();
+
+		int [][] spiralArray = new int[row][coloumn]; 
+
+		for (int i = 0; i < spiralArray.length; i++) {
+			for (int j = 0; j < spiralArray[0].length; j++) {
+
+				spiralArray[i][j] = scn.nextInt(); 
+
+			}
+		}
+
+
+
+		int minr = 0;
+		int minc = 0;
+		int maxr = spiralArray.length-1;
+		int maxc = spiralArray[0].length-1;
+		int tne = row * coloumn;
+		int cnt = 0;
+
+//		Display(spiralArray);
+
+
+
+		while(cnt < tne)
+		{
+
+			// LEFT WALL
+
+
+			for(int i = minr ,  j=minc ; i <= maxr && cnt < tne;  i++ )
+			{
+				System.out.println(spiralArray[i][j]);
+				cnt++;
+			}
+
+			minc++;
+
+			// BOTTOM WALL
+
+
+			for(int i = maxr ,  j=minc ; j <= maxc && cnt < tne;  j++ )
+			{
+				System.out.println(spiralArray[i][j]);
+				cnt++;
+			}
+			maxr--;
+
+
+			for(int i = maxr ,  j=maxc ; i >= minr && cnt < tne;  i-- )
+			{
+				System.out.println(spiralArray[i][j]);
+				cnt++;
+			}
+
+			maxc--;
+
+			for(int i = minr ,  j=maxc ; j >= minc && cnt < tne;  j-- )
+			{
+				System.out.println(spiralArray[i][j]);
+				cnt++;
+			}
+
+			minr++;
+
+		}
+
+	}
+
+}
+
+//11
+//21
+//31
+//32
+//33
+//34
+//35
+//25
+//15
+//14
+//13
+//12
+//22
+//23
+//24
+