I got this question in OA of Grab.\n![image](https://assets.leetcode.com/users/images/a68c3871-2170-499e-935a-df631bf7277e_1626001383.9770699.png)\n![image](https://assets.leetcode.com/users/images/f15c1215-590b-417a-9489-b12d62d86638_1626001390.6189961.png)\n\nCan someone have any idea , how to solve this? I tried using indegree, outdegree but that didn\'t work.

I got this question in OA of Grab.\n\n\n\nCan someone have any idea , how to solve this? I tried using indegree, outdegree but that didn\'t work.