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
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Example 2:
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| Input: coordinates = [[1,1],[2,2],[3,4],[4,5],[5,6],[7,7]]
Output: false
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Solution:
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| class Solution {
public boolean checkStraightLine(int[][] coordinates) {
// x2 - x1
int xdiff = coordinates[1][0] - coordinates[0][0];
// y2 - y1
int ydiff = coordinates[1][1] - coordinates[0][1];
for (int i = 2; i < coordinates.length; i++) {
int curr_xdiff = coordinates[i][0] - coordinates[i-1][0];
int curr_ydiff = coordinates[i][1] - coordinates[i-1][1];
if (ydiff * curr_xdiff != xdiff * curr_ydiff) {
return false;
}
}
return true;
}
}
|