// 1232. Check If It Is a Straight Line

//

// 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:

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//

//

// Input: coordinates = [[1,2],[2,3],[3,4],[4,5],[5,6],[6,7]]

// Output: true

// Example 2:

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//

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// 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.

//

// Runtime 0 ms Beats 100%

// Memory 42.9 MB Beats 17.75%

class Solution {

public boolean checkStraightLine(int[][] coordinates) {

if (coordinates.length == 2) return true;

int xDiff = coordinates[1][0] - coordinates[0][0];

int yDiff = coordinates[1][1] - coordinates[0][1];

for (int i = 2; i < coordinates.length; i++) {

if (xDiff == 0 && coordinates[i][0] - coordinates[0][0] != 0) {

return false;

} else if (yDiff == 0 && coordinates[i][1] - coordinates[0][1] != 0) {

return false;

} else if (xDiff == 0 || yDiff == 0) {

continue;

} else if ((coordinates[i][0] - coordinates[0][0]) / xDiff != (coordinates[i][1] - coordinates[0][1])/ yDiff) {

return false;

}

}

return true;

}

}