bool checkStraightLine(vector<vector<int>> &coordinates) {
int y = coordinates[1][1] - coordinates[0][1]
;
int x = coordinates[1][0] - coordinates[0][0]
;
for
(int i = 2
; i < coordinates.
size(); i++
)
if
(y *
(coordinates[i][0] - coordinates[0][0]
) != x *
(coordinates[i][1] - coordinates[0][1]
))
return false
;
return true
;
}
