제출 #544916

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
544916		mgl_diamond	Palembang Bridges (APIO15_bridge)	C++14	100 / 100	171 ms	5684 KiB

bridge

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ii pair<int, int>
#define fi first
#define se second
#define debug(x) cout << #x << ": " << x << "\n"
#define all(x) x.begin(), x.end()

template<class T> bool umax(T &a, T b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool umin(T &a, T b) { if (a>b) { a=b; return 1; } return 0; }

void setIO(string name) {
	ios_base::sync_with_stdio(0); cin.tie(0);
	freopen((name+".inp").c_str(),"r",stdin);
	freopen((name+".out").c_str(),"w",stdout);
}

bool cmp(ii &a, ii &b) { return a.fi+a.se<b.fi+b.se; }

struct med {
	ll lef, rig;
	priority_queue<int, vector<int>, greater<int>> rb;
	priority_queue<int> lb;

	void reset() {
		while (lb.size()) lb.pop();
		while (rb.size()) rb.pop();
		lef=rig=0;
	}
	void insert(int x) {
		if (lb.empty()) {
			lb.push(x);
			lef+=x;
			return;
		}

		if (x<=lb.top()) lef+=x, lb.push(x);
		else rig+=x, rb.push(x);

		if (lb.size()-1>rb.size()) {
			lef-=lb.top();
			rig+=lb.top();
			rb.push(lb.top());
			lb.pop();
		} else if (lb.size()<rb.size()) {
			lef+=rb.top();
			rig-=rb.top();
			lb.push(rb.top());
			rb.pop();
		}
	}
	ll get() {
		return rig-lef; 
	}
} med;

const int mxN=100100;
int n, k, N;
ll same_side, ans, pref[mxN];
vector<ii> v;

int main() {
	cin >> k >> n;
	for(int i=1; i<=n; ++i) {
		char c, d; int x, y;
		cin >> c >> x >> d >> y;
		if (c==d) same_side+=abs(x-y);
		else v.push_back({x, y});
	}

	N=v.size();
	sort(all(v), cmp);

	med.reset();
	for(int i=1; i<=N; ++i) {
		med.insert(v[i-1].fi);
		med.insert(v[i-1].se);
		pref[i]=med.get();
	}

	ans=pref[N];
	if (k==2) {
		med.reset();
		for(int i=N; i>=1; --i) {
			med.insert(v[i-1].fi);
			med.insert(v[i-1].se);
			umin(ans, pref[i-1]+med.get());
		}
	}

	cout << same_side+N+ans;
}

컴파일 시 표준 에러 (stderr) 메시지

bridge.cpp: In function 'void setIO(std::string)':
bridge.cpp:16:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |  freopen((name+".inp").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bridge.cpp:17:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |  freopen((name+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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