#include<bits/stdc++.h>
#define breturn return
#define ll long long
using namespace std;
vector<pair<ll, ll> > kor, hull, bruh;
pair<ll, ll> poc;
ll n, a, b, c, dp[5002];
bool ccw(pair<ll, ll> a, pair<ll, ll> b, pair<ll, ll> c) {
// cout << a.first << " " << a.second << " - " << b.first << " " << b.second << " - " << c.first << " " << c.second << '\n';
if(a.first * (b.second - c.second) + b.first * (c.second - a.second) + c.first * (a.second - b.second) < 0) breturn true;
else breturn false;
}
int main() {
cin >> n;
c = -1;
for(ll i = 0; i < n; i++) {
cin >> a >>b;
a = abs(a), b = abs(b);
kor.push_back({a, b});
}
if(n == 1) breturn cout << a * b * 4<< '\n', 0;
sort(kor.begin(), kor.end()), reverse(kor.begin(), kor.end());
hull.push_back(kor[0]);
for(ll i = 1; i < kor.size(); i++) {
if(kor[i].second > hull[hull.size() - 1].second and kor[i].first < hull[hull.size() - 1].first) hull.push_back(kor[i]);
}
reverse(hull.begin(), hull.end());
dp[0] = 0;
for(ll i = 0; i < hull.size(); i++) {
bruh.push_back({hull[i].second, dp[i]});
dp[i + 1] = 1000000000000000000;
for(ll j = 0; j < bruh.size(); j++) dp[i + 1] = min(dp[i + 1], bruh[j].first * hull[i].first + bruh[j].second);
}
cout << dp[hull.size()] * 4;
}
Compilation message
cover.cpp: In function 'int main()':
cover.cpp:24:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
24 | for(ll i = 1; i < kor.size(); i++) {
| ~~^~~~~~~~~~~~
cover.cpp:29:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
29 | for(ll i = 0; i < hull.size(); i++) {
| ~~^~~~~~~~~~~~~
cover.cpp:32:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
32 | for(ll j = 0; j < bruh.size(); j++) dp[i + 1] = min(dp[i + 1], bruh[j].first * hull[i].first + bruh[j].second);
| ~~^~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Correct |
1 ms |
364 KB |
Output is correct |
| 4 |
Correct |
1 ms |
364 KB |
Output is correct |
| 5 |
Correct |
1 ms |
364 KB |
Output is correct |
| 6 |
Correct |
1 ms |
364 KB |
Output is correct |
| 7 |
Correct |
1 ms |
368 KB |
Output is correct |
| 8 |
Correct |
2 ms |
364 KB |
Output is correct |
| 9 |
Correct |
4 ms |
492 KB |
Output is correct |
| 10 |
Correct |
5 ms |
620 KB |
Output is correct |
