Submission #221221

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
221221	2020-04-09 17:15:29	Gareth618	Tri (CEOI09_tri)	C++14	100 / 100	785 ms	29468 KiB

tri

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#include <bits/stdc++.h>
using namespace std;
struct Point {
    int x, y;
    static int64_t ccw(const Point& a, const Point& b, const Point& c) {
        return 1LL * (a.x - b.x) * (b.y - c.y) - 1LL * (b.x - c.x) * (a.y - b.y);
    }
    inline bool operator<(const Point& p) const {
        return 1LL * y * p.x - 1LL * x * p.y < 0;
    }
};
vector<Point> convexHull(vector<Point>& pts) {
    vector<Point> st;
    st.push_back(pts[0]);
    st.push_back(pts[1]);
    for (int i = 2; i < (int) pts.size(); i++) {
        while (st.size() > 1 && Point::ccw(st[st.size() - 2], st[st.size() - 1], pts[i]) >= 0)
            st.pop_back();
        st.push_back(pts[i]);
    }
    return st;
}
bool below(vector<Point>& hull, Point a, Point b) {
    int lo = 0, hi = hull.size() - 1;
    while (hi - lo > 4) {
        int m1 = (lo + hi) / 2;
        int m2 = (lo + hi) / 2 + 1;
 
 
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• Subtask 1: 100 / 100