Submission #943113

#	Time	Username	Problem	Language	Result	Execution time	Memory
943113		oblantis	Palembang Bridges (APIO15_bridge)	C++17	0 / 100	1 ms	348 KiB

bridge

//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
//#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
#define all(v) v.begin(), v.end()
#define pb push_back
#define ss second
#define ff first
#define vt vector
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const ll inf = 1e18;
const int mod = 1e9+7;
const int maxn = 1e6 + 1;

bool cmp(pll x, pll y){
	return x.ff + x.ss < y.ff + y.ss;
}
void solve() {
	int k, n;
	cin >> k >> n;
	ll ans = 0, s = inf;
	vt<pair<ll, ll>> v;
	for(int i = 0; i < n; i++){
		char a, b;
		int x, y;
		cin >> a >> x >> b >> y;
		if(x > y)swap(x, y);
		if(a != b){
			v.pb({x, y});
			ans++;
		}
		else ans += y - x;
	}
	sort(all(v), cmp);
	n = v.size();
	ll dp[n], wt = 0;
	multiset<ll> m1, m2;
	for(int i = 0; i < n; i++){
		m1.insert(v[i].ff), m2.insert(v[i].ss);
		wt += v[i].ss - v[i].ff;
		while(*m2.begin() < *m1.rbegin()){
			int x = *m1.rbegin(), y = *m2.begin();
			wt += (x - y) * 2;
			m2.erase(m2.begin()), m1.erase(--m1.end());
			m2.insert(x), m1.insert(y);
		}
		dp[i] = wt;
	}
	s = dp[n - 1];
	m1.clear(), m2.clear();
	wt = 0;
	for(int i = n - 1; i >= 0; i--){
		m1.insert(v[i].ff), m2.insert(v[i].ss);
		wt += v[i].ss - v[i].ff;
		while(*m2.begin() < *m1.rbegin()){
			int x = *m1.rbegin(), y = *m2.begin();
			wt += (x - y) * 2;
			m2.erase(m2.begin()), m1.erase(--m1.end());
			m2.insert(x), m1.insert(y);
		}
		if(i)s = min(s, dp[i - 1] + wt);		
	}
	cout << ans + s % inf << '\n';
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int times = 1;
	//cin >> times;
	for(int i = 1; i <= times; i++) {
		solve();
	}
	return 0;
}

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