Mobileum interview question

round1 : written test with apititude,dbms,oops and a dsa question. round 2 : technical interview on pretty standard problems of stack(validate parenthesis),map(frequncy of charecters),heap and recursion(reversing of array) round 3: group activity of building a bridge with a team of 5 people assesing our communicatoion and colloborating skills. round 4: based on resume some questions on intern experince,skills that i have, puzzle of revolver and prisoner with two slots empty, egg dropping problem,longest consecutive ssequnce of numbers in an array