Kattis - Birthday Cake

Count the number of pieces. For each candle, the piece it's on is determined by which side of each line it lies on.

1#include <bits/stdc++.h>
2using namespace std;
3 
4using ll = long long;
5using ld = long double;
6using db = double; 
7using str = string; // yay python!
8
9using pi = pair<int,int>;
10using pl = pair<ll,ll>;