Kiểm tra tính liên thông

a = [
        [0,1,1],
        [1,0,1],
        [1,1,0]
    ];
danhDau = [];
soMienLienThong = 0;
function xetLienThong () {
    for (var i = 0; i < a.length; i++) { //Khoi tao chua duyet qua bat ki dinh nao
        danhDau[i]=0;
    };
    soMienLienThong = 0;
    for (var i = 0; i < a.length; i++) {
        if(danhDau[i]===0) //Kiem tra chua duyet qua dinh hien tai
        {
            soMienLienThong ++;
            thamDinh(i,soMienLienThong);
        }
    };
    return soMienLienThong;
}
function thamDinh (i,mienLienThong) {
    danhDau[i] = mienLienThong;
    for (var j = 0; j < a.length; j++) {
        if((danhDau[j]===0)&&(a[i][j]>0||a[j][i]>0)){//Duyet qua nhung dinh ke voi dinh dang xet
            thamDinh(j,mienLienThong);//Tham dinh
        }
    };

}