Add day 25

Author: MadhavBahl

day25/JavaScript/rotateTile.js

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+/**
+ * @author MadhavBahlMD
+ * @date 23/01/2019
+ * Method -- Creating a new matrix to represent the rotated tile
+ */
+
+function rotateTile (arr) {
+    let n = arr.length;
+
+    // print the original tile
+    console.log ('Original Tile: ');
+    let toPrint = '';
+    for (let array of arr) {
+        toPrint = '';
+        for (let element of array) {
+            toPrint += element + ' ';
+        }
+        console.log (toPrint);
+    }
+
+    // Make another tile to store the rotated tile
+    let rotatedTile = [];
+    // Initialize with zeros
+    for (let i=0; i<n; i++) {
+        let row = [];
+        for (let j=0; j<n; j++) {
+            row.push(0);
+        }
+        rotatedTile.push (row);
+    }
+
+    for (let i=0; i<n; i++) {
+        for (let j=0; j<n; j++)
+            rotatedTile [i][j] = arr[(n-j)-1][i];
+    }
+
+    // print the rotated tile
+    console.log ('Rotated Tile: ');
+    for (let array of rotatedTile) {
+        toPrint = '';
+        for (let element of array) {
+            toPrint += element + ' ';
+        }
+        console.log (toPrint);
+    }
+
+    return rotatedTile;
+}
+
+rotateTile ([[1, 2, 3], [4, 5, 6], [7, 8, 9]]);

day25/JavaScript/rotateTile2.js

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+// /**
+//  * @author MadhavBahlMD
+//  * @date 23/01/2019
+//  * Method -- Changing the existing tile
+//  */
+
+// function rotateTile (arr) {
+//     let n = arr.length;
+
+//     // print the original tile
+//     console.log ('Original Tile: ');
+//     let toPrint = '';
+//     for (let array of arr) {
+//         toPrint = '';
+//         for (let element of array) {
+//             toPrint += element + ' ';
+//         }
+//         console.log (toPrint);
+//     }
+
+    
+
+//     return arr;
+// }
+
+// rotateTile ([[1, 2, 3], [4, 5, 6], [7, 8, 9]]);

day25/README.md

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+![cover](./cover.png)
+
+# Day 25 - Array Series Part 8: Rotate Square Tile
+
+**Question** -- Given a 2 dimensional (NxN) square array, write a function that rotates the given array by 90 degrees clockwise
+
+**Example**
+
+```
+input:
+[
+    [1, 2, 3],
+    [4, 5, 6],
+    [7, 8, 9]
+]
+
+output: 
+[
+    [7, 4, 1],
+    [8, 5, 2],
+    [9, 6, 3]
+]
+```
+
+![ques](./ques.png)
+
+## Solution
+
+## JavaScript Implementation
+
+### [Solution 1 -- Creating a new matrix for rotated tile](./JavaScript/rotateTile.js)
+
+#### Main Logic:
+
+```js
+for (let i=0; i<n; i++) {
+    for (let j=0; j<n; j++)
+        rotatedTile [i][j] = arr[(n-j)-1][i];
+}
+```
+
+#### Complete Code:
+
+```js
+/**
+ * @author MadhavBahlMD
+ * @date 23/01/2019
+ * Method -- Creating a new matrix to represent the rotated tile
+ */
+
+function rotateTile (arr) {
+    let n = arr.length;
+
+    // print the original tile
+    console.log ('Original Tile: ');
+    let toPrint = '';
+    for (let array of arr) {
+        toPrint = '';
+        for (let element of array) {
+            toPrint += element + ' ';
+        }
+        console.log (toPrint);
+    }
+
+    // Make another tile to store the rotated tile
+    let rotatedTile = [];
+    // Initialize with zeros
+    for (let i=0; i<n; i++) {
+        let row = [];
+        for (let j=0; j<n; j++) {
+            row.push(0);
+        }
+        rotatedTile.push (row);
+    }
+
+    for (let i=0; i<n; i++) {
+        for (let j=0; j<n; j++)
+            rotatedTile [i][j] = arr[(n-j)-1][i];
+    }
+
+    // print the rotated tile
+    console.log ('Rotated Tile: ');
+    for (let array of rotatedTile) {
+        toPrint = '';
+        for (let element of array) {
+            toPrint += element + ' ';
+        }
+        console.log (toPrint);
+    }
+
+    return rotatedTile;
+}
+
+rotateTile ([[1, 2, 3], [4, 5, 6], [7, 8, 9]]);
+```
+
+### [Solution 2 -- Changing the original tile](./JavaScript/rotateTile2.js)
+
+```js
+To be added
+```