Leap Software Development Engineer 2 interview questions

 Given a data set with details pertaining to amount that one person owes to the other in the form of csv
. Sample Input Friend 1 Friend 2 Amount M N 20 L M 70 N L 40 N K 100 M N 10 N M 5 Row 1 implies that M owed 20 Rs to N
Row 2 implies that L owed 70 Rs to M
Similar to other rows

Given the above info, design a solution to derive the below-mentioned insights : How much debt does each person owe to all users?  How much money is a person owed ? Who is the person with the most money owed ? Who is the person with the most debt ?  Sample input in CSV:
 M,N,20 L,M,70 N,L,40 N,K,100 M,N,10 N,M,5