Submission #882935

#	Time	Username	Problem	Language	Result	Execution time	Memory
882935		NotLinux	Palembang Bridges (APIO15_bridge)	C++17	78 / 100	115 ms	7872 KiB

bridge

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
// PUT IT BEFORE THE INCLUDE
#include <bits/stdc++.h>
using namespace std;
const long long inf = 1e18 + 7;
template<class T, class Container = vector<T>, class Compare = less<T>>
struct PriorityQueue {
  int sz = 0;
  priority_queue<T, Container, Compare> pq, del;
 
  void emplace(const T &val) { pq.emplace(val); ++sz; }
  void erase(const T &val) { del.emplace(val); --sz; }
  void pop() { erase(top()); }
  T top() {
    while (!del.empty() && !pq.empty() && del.top() == pq.top()) del.pop(), pq.pop();
    return pq.top();
  }
  int size() const {return sz;}
};
 
template<class T>
struct MedianHeap {
	long long sumlo = 0 , sumhi = 0;
  PriorityQueue<T> lo;
  PriorityQueue<T, vector<T>, greater<T>> hi; 
 
  void Fix() {
    while (hi.size() > lo.size()){
    	sumlo += hi.top();
    	sumhi -= hi.top();
    	lo.emplace(hi.top());
    	hi.pop();
    }
    while (lo.size() > hi.size() + 1){
    	sumhi += lo.top();
    	sumlo -= lo.top();
    	hi.emplace(lo.top());
    	lo.pop();
    }
  }
  
  void emplace(const T &val) {
    if (lo.size() == 0 || val <= lo.top()){
    	sumlo += val;
    	lo.emplace(val);
    }
    else {
    	sumhi += val;
    	hi.emplace(val);
    }
    Fix();
  }
 
  void erase(const T &val) {
    if (lo.size() && val <= lo.top()){
    	sumlo -= val;
    	lo.erase(val);
    }
    else {
    	sumhi -= val;
    	hi.erase(val);
    }
    Fix();
  }
  long long get_ans(){
  	return (1ll * lo.top() * lo.size() - sumlo) + (sumhi - 1ll * lo.top() * hi.size());
  }
  T top() { return lo.top(); }
};
bool cmp(array < int , 3 > const& a , array < int , 3 > const& b){
	return a[0] < b[0];
}
void solve(){
	int k,n;
	long long ans0 = 0;
	cin >> k >> n;
	vector < array < int , 3 > > v2;
	for(int i = 0;i<n;i++){
		char c1,c2;
		int p1,p2;
		cin >> c1 >> p1 >> c2 >> p2;
		if(c1 == c2){
			ans0 += abs(p1 - p2);
		}
		else{
			v2.push_back({p1 + p2 , p1 , p2});
		}
	}
	sort(v2.begin() , v2.end() , cmp);
	MedianHeap<int> med1 , med2;
	for(auto itr : v2){
		med2.emplace(itr[1]);
		med2.emplace(itr[2]);
	}
	long long ans1 = inf;
	if(k == 1){
		ans1 = med2.get_ans();
	}
	else{
		for(auto itr : v2){
			med2.erase(itr[1]);
			med2.erase(itr[2]);
			med1.emplace(itr[1]);
			med1.emplace(itr[2]);
			ans1 = min(ans1 , med1.get_ans() + med2.get_ans());
		}
	}
	cout << ans0 + (ans1 == inf ? 0ll : ans1) + v2.size() << '\n';
}
signed main(){
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int testcase = 1;//cin >> testcase;
	while(testcase--)solve();
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 14
• Subtask 3: 9 / 9
• Subtask 4: 32 / 32
• Subtask 5: 37 / 37