JAVA

sort 2d array by column java

Arrays.sort(contests, (a, b) -> Integer.compare(b[0],a[0])); //decreasing order
    
Arrays.sort(contests, (a, b) -> Integer.compare(a[0],b[0]); //increasing order

sort 2d array based on one column java

Arrays.sort(array, Comparator.comparingDouble(o -> o[0]));