제출 #466659

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
466659		cgiosy	Palembang Bridges (APIO15_bridge)	C++17	0 / 100	1 ms	204 KiB

bridge

#include <bits/stdc++.h>
#define clear(X) decltype(X)().swap(X);
using namespace std;
using ll=long long;

struct pii {
	int l, r;
	bool operator<(pii b) const { return l+r<b.l+b.r; }
};

int main() {
	ios::sync_with_stdio(0);cin.tie(0);
	int K, N, M=0;
	cin>>K>>N;
	pii A[N];
	ll s=0;
	for(int i=0; i<N; i++) {
		char a, b;
		int l, r;
		cin>>a>>l>>b>>r;
		if(l>r) swap(l, r);
		if(a!=b) A[M++]={l, r};
		else s+=r-l;
	}
	N=M;
	s+=N;

	sort(A, A+N);
	ll B[N], w=0;
	priority_queue<int> L;
	priority_queue<int, vector<int>, greater<int>> R;
	auto balance=[&] {
		if(L.size()>R.size()) {
			int v=L.top();
			L.pop(), R.push(v);
			w+=v*2;
		} else if(L.top()>R.top()) {
			int l=L.top(), r=R.top();
			L.pop(), L.push(r);
			R.pop(), R.push(l);
			w+=(l-r)*2;
		}
	};
	for(int i=0; i<N; i++) {
		auto[l,r]=A[i];
		L.push(l), w-=l;
		balance();
		L.push(r), w-=r;
		balance();
		B[i]=w;
	}
	w=0;
	clear(L);
	clear(R);
	ll t=B[N-1];
	if(K==2 && N) for(int i=N; --i;) {
		auto[l,r]=A[i];
		L.push(l), w-=l;
		balance();
		L.push(r), w-=r;
		balance();
		t=min(t, w+B[i-1]);
	}
	cout<<s+t<<'\n';
}

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• Subtask 2: 0 / 14
• Subtask 3: 0 / 9
• Subtask 4: 0 / 32
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