| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 539231 |
2022-03-18T15:23:58 Z |
joelau |
Planine (COCI21_planine) |
C++14 |
|
304 ms |
46628 KB |
#include <bits/stdc++.h>
using namespace std;
long long N,H;
pair<long long,long long> A[1000005];
vector< pair<long double,long double> > lst;
vector<long long> v;
int main() {
ios_base::sync_with_stdio(false); cin.tie(NULL);
cin >> N >> H;
for (long long i = 0; i < N; ++i) cin >> A[i].first >> A[i].second;
for (long long i = 2; i < N-1; i += 2) {
while (v.size() >= 2 && (A[i-1].second - A[v[v.size()-2]].second) * (A[i-1].first - A[v.back()].first) <= (A[i-1].second - A[v.back()].second) * (A[i-1].first - A[v[v.size()-2]].first))
v.pop_back();
v.push_back(i-1);
long long low = 0, high = v.size();
while (high - low > 1) {
long long mid = (low+high)/2;
if ((A[i].second - A[v[mid-1]].second) * (A[i].first - A[v[mid]].first) <= (A[i].second - A[v[mid]].second) * (A[i].first - A[v[mid-1]].first)) high = mid;
else low = mid;
}
lst.emplace_back(0,A[i].first - (long double) (A[i].first - A[v[low]].first) * (H - A[i].second) / (A[v[low]].second - A[i].second));
}
v.clear();
for (long long i = N-3; i > 0; i -= 2) {
while (v.size() >= 2 && (A[i+1].second - A[v[v.size()-2]].second) * (A[i+1].first - A[v.back()].first) >= (A[i+1].second - A[v.back()].second) * (A[i+1].first - A[v[v.size()-2]].first))
v.pop_back();
v.push_back(i+1);
long long low = 0, high = v.size();
while (high - low > 1) {
long long mid = (low+high)/2;
if ((A[i].second - A[v[mid-1]].second) * (A[i].first - A[v[mid]].first) >= (A[i].second - A[v[mid]].second) * (A[i].first - A[v[mid-1]].first)) high = mid;
else low = mid;
}
lst[i/2-1].first = A[i].first + (long double) (A[v[low]].first - A[i].first) * (H - A[i].second) / (A[v[low]].second - A[i].second);
}
sort(lst.begin(),lst.end());
long long ans = 0;
long double n = -1e18;
for (auto x: lst) if (n < x.second) ans++, n = x.first;
cout << ans;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
976 KB |
Output is correct |
| 2 |
Correct |
3 ms |
964 KB |
Output is correct |
| 3 |
Correct |
4 ms |
976 KB |
Output is correct |
| 4 |
Correct |
22 ms |
5056 KB |
Output is correct |
| 5 |
Correct |
23 ms |
5192 KB |
Output is correct |
| 6 |
Correct |
26 ms |
5440 KB |
Output is correct |
| 7 |
Correct |
208 ms |
34596 KB |
Output is correct |
| 8 |
Correct |
284 ms |
34596 KB |
Output is correct |
| 9 |
Correct |
236 ms |
34524 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
340 KB |
Output is correct |
| 2 |
Correct |
1 ms |
344 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
340 KB |
Output is correct |
| 5 |
Correct |
1 ms |
332 KB |
Output is correct |
| 6 |
Correct |
1 ms |
340 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
976 KB |
Output is correct |
| 2 |
Correct |
3 ms |
964 KB |
Output is correct |
| 3 |
Correct |
4 ms |
976 KB |
Output is correct |
| 4 |
Correct |
22 ms |
5056 KB |
Output is correct |
| 5 |
Correct |
23 ms |
5192 KB |
Output is correct |
| 6 |
Correct |
26 ms |
5440 KB |
Output is correct |
| 7 |
Correct |
208 ms |
34596 KB |
Output is correct |
| 8 |
Correct |
284 ms |
34596 KB |
Output is correct |
| 9 |
Correct |
236 ms |
34524 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
1 ms |
344 KB |
Output is correct |
| 12 |
Correct |
1 ms |
212 KB |
Output is correct |
| 13 |
Correct |
1 ms |
340 KB |
Output is correct |
| 14 |
Correct |
1 ms |
332 KB |
Output is correct |
| 15 |
Correct |
1 ms |
340 KB |
Output is correct |
| 16 |
Correct |
1 ms |
212 KB |
Output is correct |
| 17 |
Correct |
238 ms |
43500 KB |
Output is correct |
| 18 |
Correct |
282 ms |
43344 KB |
Output is correct |
| 19 |
Correct |
27 ms |
5068 KB |
Output is correct |
| 20 |
Correct |
242 ms |
42548 KB |
Output is correct |
| 21 |
Correct |
28 ms |
4980 KB |
Output is correct |
| 22 |
Correct |
293 ms |
46340 KB |
Output is correct |
| 23 |
Correct |
1 ms |
332 KB |
Output is correct |
| 24 |
Correct |
271 ms |
45512 KB |
Output is correct |
| 25 |
Correct |
25 ms |
5080 KB |
Output is correct |
| 26 |
Correct |
304 ms |
46628 KB |
Output is correct |
| 27 |
Correct |
16 ms |
2728 KB |
Output is correct |
