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Edit on GithubUSACO Platinum 2019 Open - Valleys
Author: Benjamin Qi
No need to measure "curvature" ... Just maintain # of holes in each region with two DSUs.
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1#include <bits/stdc++.h>2using namespace std;34using ll = long long;5using ld = long double;6using db = double;7using str = string; // yay python!89using pi = pair<int,int>;10using pl = pair<ll,ll>;
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