Codeforces -A. Ice Skating :Can someone explain the test case?

[ayush29azad]

Can someone explain the test cases given in the problem ,I am not able to understand this question…

Problem - 217A - Codeforces

2
2 1
1 2

how the output is 1??

[ameybhavsar]

You can only move up, down, left and right. Hence, you need an additional point at (1,1) to reach from any point to any other.

[ayush29azad]

Thanks bro !!!