Can You give me the hint to solve this problem?

#1

Can You give me the hint to solve this problem?
https://codeforces.com/problemset/problem/165/A
I was thinking of using it with Maps but not finding a proper way?

#2

hello @cbcao263

yeah u can solve this problem using map/set.

just declare ur map as
map< pair< int ,int> , bool > mp;

to makr any corrdinate (x,y) as true.
use mp[ make_pair(x,y) ]=true;

and to check whether (x, y ) corrdinate is present or not.
use mp.count( make_pair(x,y) )

using above two methods u can easily solve this problem

#3

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