you give m x n integer grid account accountsij money ith customer jth bank Return wealth rich customer hasa customer wealth money bank account the rich customer customer maximum wealth Example 1input account 123321output 6Explanation1st customer wealth 1 2 3 62nd customer wealth 3 2 1 6both customer consider rich wealth 6 return 6example 2input account 157335output 10explanation 1st customer wealth 62nd customer wealth 10 3rd customer wealth 8the 2nd customer rich wealth 10example 3input account 287713195output 17 Constraintsm accountslengthn accountsilength1 m n 501 accountsij 100