solves check if is on straight line

Author: anishLearnsToCode

README.md

@@ -321,8 +321,8 @@
 | 1213 | 🔒 [Intersection of Three Sorted Arrays](https://leetcode.com/problems/intersection-of-three-sorted-arrays)                                          |                                                                                                                                                                             |                                                                                                                                   |
 | 1217 | [Minimum Cost to Move Chips to The Same Position](https://leetcode.com/problems/minimum-cost-to-move-chips-to-the-same-position)                     |                                                [![Java](assets/java.png)](src/MinimumCostToMoveChipsToTheSamePosition.java)                                                 |                                                                                                                                   |
 | 1221 | [Split A String In Balanced Strings](https://leetcode.com/problems/split-a-string-in-balanced-strings)                                               |                                                     [![Java](assets/java.png)](src/SplitAStringInBalancedStrings.java)                                                      |                                                                                                                                   |
-| 1228 | [Missing A Number In Arithmetic Progression](https://leetcode.com/problems/missing-number-in-arithmetic-progression)                                 |                                                                                                                                                                             |                                                                                                                                   |
-| 1232 | [Check If It Is A Straight Line](https://leetcode.com/problems/check-if-it-is-a-straight-line)                                                       |                                                                                                                                                                             |                                                                                                                                   |
+| 1228 | 🔒 [Missing A Number In Arithmetic Progression](https://leetcode.com/problems/missing-number-in-arithmetic-progression)                              |                                                                                                                                                                             |                                                                                                                                   |
+| 1232 | [Check If It Is A Straight Line](https://leetcode.com/problems/check-if-it-is-a-straight-line)                                                       |                                                       [![Java](assets/java.png)](src/CheckIfItIsASStraightLine.java)                                                        |                                                                                                                                   |
 | 1237 | [Find Positive Integer Solutions for a Given Equation](https://leetcode.com/problems/find-positive-integer-solution-for-a-given-equation)            |                                                                                                                                                                             |                                                                                                                                   |
 | 1243 | [Array Transformation](https://leetcode.com/problems/array-transformation)                                                                           |                                                                                                                                                                             |                                                                                                                                   |
 | 1252 | [Cells With Odd Values In Matrix](https://leetcode.com/problems/cells-with-odd-values-in-a-matrix)                                                   |                                                                                                                                                                             |                                                                                                                                   |

src/CheckIfItIsASStraightLine.java

@@ -0,0 +1,16 @@
+public class CheckIfItIsASStraightLine {
+    public boolean checkStraightLine(int[][] coordinates) {
+        for (int i = 0 ; i < coordinates.length - 2 ; i++) {
+            if (!isOnStraightLine(coordinates[i], coordinates[i + 1], coordinates[i + 2])) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private boolean isOnStraightLine(int[] p1, int[] p2, int[] p3) {
+        if (p1[0] == p2[0] && p2[0] == p3[0]) return true;
+        if (p1[1] == p2[1] && p2[1] == p3[1]) return true;
+        return (p2[1] - p1[1]) * (p3[0] - p2[0]) == (p3[1] - p2[1]) * (p2[0] - p1[0]);
+    }
+}