/*Each coordinate separate with "," */
/*Each x-axis and y-axis separate with a space*/
var test = "[1 1],[3 2],[5 3],[4 1],[2 3],[1 4]";
//var test = "[1 1],[2 2],[3 3]";
var node = test.split(",");
nodeLen = node.length;
var coord = [];
var x_axis = [];
var y_axis = [];
text = "Input: ";
for (i = 0; i < nodeLen; i++) {
    coord[i] = node[i].split("\[")[1].split("\]")[0];
    x_axis[i] = coord[i].split(" ")[0];

    y_axis[i] = coord[i].split(" ")[1];

    text += "[" + x_axis[i] + " " + y_axis[i] + "]";
    if (i < nodeLen - 1) {
        text += ",";
    }

}
text += "<br/>";

var x0 = 0;
var y0 = 0;
var x1 = 0;
var y1 = 0;
var x2 = 0;
var y2 = 0;
var slope01 = 0;
var slope12 = 0;
var cnt_arr = [];
tet = "<ul>";
for (i = 0; i < nodeLen; i++) {
    for (j = i + 1; j < nodeLen; j++) {
        var cnt = 2;

        for (k = j + 1; k < nodeLen; k++) {
            x0 = x_axis[i];
            y0 = y_axis[i];
            x1 = x_axis[j];
            y1 = y_axis[j];
            slope01 = (y1 - y0) / (x1 - x0);
            x2 = x_axis[k];
            y2 = y_axis[k];
            slope12 = (y2 - y1) / (x2 - x1);
            if (slope01 == slope12) {
                cnt += 1;
            }

            cnt_arr.push(cnt);
        }


    }
}

cnt_arr.sort(function(a, b) {
    return a - b;
});
document.getElementById("show").innerHTML = text + "Output: " + cnt_arr[cnt_arr.length - 1];
Setting Validate Copy Format