Submission #336784

#	Time	Username	Problem	Language	Result	Execution time	Memory
336784		lovro_nidogon1	Cover (COCI18_cover)	C++14	120 / 120	5 ms	620 KiB

cover

#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 (stderr)

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);
      |                 ~~^~~~~~~~~~~~~

• Subtask 1: 120 / 120