Submission #537487

#	Time	Username	Problem	Language	Result	Execution time	Memory
537487		joelau	Planine (COCI21_planine)	C++14	20 / 110	230 ms	24692 KiB

Main

#include <bits/stdc++.h>
using namespace std;

int N,H;
pair<int,int> A[1000005];
vector< pair<long double,long double> > lst;

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    cin >> N >> H;
    for (int i = 0; i < N; ++i) cin >> A[i].first >> A[i].second;
    for (int i = 2; i < N-1; i += 2) {
        long double x1 = A[i].first - (long double) (A[i].first - A[i-1].first) / (A[i-1].second - A[i].second) * (H - A[i].second);
        long double x2 = A[i].first + (long double) (A[i+1].first - A[i].first) / (A[i+1].second - A[i].second) * (H - A[i].second);
        lst.emplace_back(x2,x1);
    }
    sort(lst.begin(),lst.end());
    int ans = 0;
    long double n = -1e18;
    for (auto x: lst) if (n < x.second) ans++, n = x.first;
    cout << ans;

    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 60