* max increasing subsequence
 * @param arr int整型一维数组 the array
 * @return int整型
 */
function MLS( arr ) {
    // write code here
    arr.sort(function(a,b){return a - b;});
    if(arr.length <= 1)
        return arr.length;
    let num = 1,max = 1;
    for(let i = 1;i < arr.length;i++){
        if(arr[i] == arr[i - 1]) continue;
        if(arr[i] == arr[i - 1] + 1){
            num++;
        }else{
            num = 1;
        }
        if(num > max)    max = num;
    }
    return max;
}
module.exports = {
    MLS : MLS
};

alt