Create Day 8 Check If It Is a Straight Line.cpp

Author: tusharjaiswal123

Day 8 Check If It Is a Straight Line.cpp

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+PROBLEM:
+
+
+You are given an array coordinates, coordinates[i] = [x, y], where [x, y] represents the coordinate of a point.
+Check if these points make a straight line in the XY plane.
+
+Example 1:
+Input: coordinates = [[1,2],[2,3],[3,4],[4,5],[5,6],[6,7]]
+Output: true
+
+Example 2:
+Input: coordinates = [[1,1],[2,2],[3,4],[4,5],[5,6],[7,7]]
+Output: false
+ 
+
+Constraints:
+
+2 <= coordinates.length <= 1000
+coordinates[i].length == 2
+-10^4 <= coordinates[i][0], coordinates[i][1] <= 10^4
+coordinates contains no duplicate point.
+
+
+
+SOLUTION:
+
+
+
+class Solution {
+public:
+    bool checkStraightLine(vector<vector<int>>& coordinates) {
+        int n=coordinates.size();
+        int m=2,i;
+        
+        if(n<3)
+        {
+            return true;
+        }
+        
+        for(i=0;i+2<n;i++)
+        {   
+            if( (coordinates[i+1][0]-coordinates[i][0])*(coordinates[i+2][1]-coordinates[i+1][1]) ==                           (coordinates[i+2][0]-coordinates[i+1][0])*(coordinates[i+1][1]-coordinates[i][1])  ) 
+            {
+                continue;
+            }
+            else
+                return false;
+        }
+        
+        return true;
+    }
+};