Submission #1042398

#	Time	Username	Problem	Language	Result	Execution time	Memory
1042398		Math4Life2020	Palembang Bridges (APIO15_bridge)	C++17	22 / 100	48 ms	7416 KiB

bridge

#include <bits/stdc++.h>
using namespace std;
using ll = long long; using pii = pair<ll,ll>;

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0);
	ll K,N; cin >> K >> N;
	vector<pii> v;
	ll ans = 0;
	for (ll i=0;i<N;i++) {
		string p,q; ll s,t;
		cin >> p >> s >> q >> t;
		if (p==q) {
			ans += abs(s-t);
		} else {
			ans++;
			v.push_back({min(s,t),max(s,t)});
		}
	}
	vector<ll> v2;
	for (pii p0: v) {
		v2.push_back(p0.first);
		v2.push_back(p0.second);
	}
	if (K==1) {
		sort(v2.begin(),v2.end());
		for (ll x: v2) {
			ans += abs(x-v2[v2.size()/2]);
		}
		cout << ans; exit(0);
	}
	ll emin = 1e18;
	for (ll a: v2) {
		ll ec = 0;
		priority_queue<pii> PQ; //-pos,sign(+1/-1)
		for (pii p0: v) {
			ll x = p0.first; ll y = p0.second;
			ec += abs(a-x)+abs(a-y);
			if (a<x || a>y) {
				PQ.push({-a,-1});
				PQ.push({-x,1});
				PQ.push({-y,1});
				PQ.push({-x-y+a,-1});
			}
		}
		ll xmin = 1e18;
		ll sp=0; ll sn=0;
		while (!PQ.empty()) {
			pii p0 = PQ.top(); PQ.pop();
			ll p = -p0.first; ll n = p0.second;
			xmin = min(xmin,(p*sn-sp));
			sp += p*n; sn += n;
		}
		emin = min(emin,2*xmin+ec);
	}
	cout << (emin+ans);
}

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