* https://leetcode.com/problems/subarray-sum-equals-k/ \n* https://leetcode.com/problems/sort-array-by-increasing-frequency/\n* decimal to binary and find kth bit from right\n* given two array of strings, with one being smaller than other   find string which are not present in smaller string. \n words in each string are in relative order. ex string 1 : ( My Favorite food is Thai)  : string 2: food thai\n Answer : My Favorite is\n\n4 questions - 90 minutes.

https://leetcode.com/problems/subarray-sum-equals-k/ \n https://leetcode.com/problems/sort-array-by-increasing-frequency/\n decimal to binary and find kth bit f