Submission #1202712

#TimeUsernameProblemLanguageResultExecution timeMemory
1202712loomTriangles (CEOI18_tri)C++20
0 / 100
0 ms328 KiB
#include<bits/stdc++.h> #include "trilib.h" using namespace std; #define inf 5e18 #define nl '\n' bool cmp(int a, int b){ return is_clockwise(1, a, b); } vector<int> func(vector<int>& v){ sort(v.begin(), v.end(), cmp); vector<int> ans; ans.push_back(1); for(int x : v){ while(ans.size() >= 2 and !is_clockwise(ans[ans.size()-2], ans.back(), x)) ans.pop_back(); ans.push_back(x); } return ans; } inline void solve(){ int n = get_n(); vector<int> a{2}, b{2}; for(int i=3; i<=n; i++){ (is_clockwise(1, 2, i) ? b : a).push_back(i); } a = func(a); b = func(b); int ans = a.size() + b.size() - 2; a.push_back(1); while(min(a.size(), b.size()) >= 3 and is_clockwise(b[b.size()-2], a[1], b.back())) ans--, b.pop_back(); while(min(a.size(), b.size()) >= 3 and is_clockwise(a[a.size()-2], b[2], a.back())) ans--, a.pop_back(); give_answer(ans); } signed main(){ int t = 1; //cin>>t; while(t--) solve(); return 0; }
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