Monthly Archives: February 2015

i: which skips duplicate numbers 4 sum with hashing public class Solution { public ArrayList<ArrayList> fourSum(ArrayList a, int b) { ArrayList<ArrayList> result = new ArrayList<ArrayList>(); HashSet<ArrayList> set = new HashSet<ArrayList>(); if(a == null || a.size() < 4) return result; Collections.sort(a); … Continue reading →

// returning end because for example x = 2, initial s = 1, e = 1, mid = 1, mid*mide the loop terminates so end holds the floor of sqrt Without long:

//max product subarray

//Bulls and Cows

//using DP easy one