BFS Snakes and Ladders problem

Problem : Snakes and Ladders: The Quickest Way Up
I have a bit different approach than the expected solution (http://theoryofprogramming.com/2014/12/25/snakes-and-ladders-game-code/)
Let ‘s’ be the start of the ladder vertex and ‘e’ the end of ladder. They are replacing s with e for the previous 6 vertices of start vertex ‘s’. Same for snakes.

What I am doing:
adj[s] = adj[e]
i.e making the neighbours of the end vertex as neighbours of start vertex (as start and end are essentially
the same vertices as they have been connected by a ladder); which sounds logical to me. But I am not passing 3 testcases. Can someone please point out my mistake?
My full solution: https://ideone.com/SgCeeL
Rest of the things are same as solution, like building graph w/o snakes and ladders and applying BFS.

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