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public class Ch1 {
public static void main(String[] args) {
System.out.println(straight_line(new int[][]{{2, 1}, {2, 3}, {2, 5}}));
System.out.println(straight_line(new int[][]{{1, 4}, {3, 4}, {10, 4}}));
System.out.println(straight_line(new int[][]{{0, 0}, {1, 1}, {2, 3}}));
System.out.println(straight_line(new int[][]{{1, 1}, {1, 1}, {1, 1}}));
System.out.println(straight_line(new int[][]{{1000000, 1000000},
{2000000, 2000000}, {3000000, 3000000}}));
}
private static boolean straight_line(int[][] arr) {
int x1 = arr[0][0], y1 = arr[0][1], x2 = arr[1][0], y2 = arr[1][1];
for (int i = 2; i < arr.length; ++i) {
int x = arr[i][0], y = arr[i][1];
if ((x - x1) * (y2 - y1) != (y - y1) * (x2 - x1)) return false;
}
return true;
}
}
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