Submission #412273

#	Time	Username	Problem	Language	Result	Execution time	Memory
412273		amoo_safar	Arranging Tickets (JOI17_arranging_tickets)	C++17	65 / 100	16 ms	19480 KiB

arranging_tickets

// vaziat meshki-ghermeze !
#include <bits/stdc++.h>

#define pb push_back
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " : " << x << '\n'

using namespace std;

typedef long long ll;
typedef long double ld;
typedef string str;
typedef pair<ll, ll> pll;

const ll Mod = 1000000007LL;
const int N = 2e5 + 10;
const ll Inf = 2242545357980376863LL;
const ll Log = 30;

vector<int> G[N], H[N];
int n, m;

void Add_Edge(int u, int v){
	G[u].pb(v);
	H[v].pb(u);
}

int ps[N];

int Solve(int l, int r, int dif){
	memset(ps, 0, sizeof ps);
	multiset<int> ms;

	int res = 0;
	for(int i = l; i < r - 1; i++){
		for(auto x : G[i]){
			if(x >= r) continue;
			ps[i] ++;
			ps[x] --;
			ms.insert(x);
		}
		ps[i] += ps[i - 1];
		while(ps[i] > dif){
			int fr = *ms.rbegin();
			ms.erase(ms.find(fr));
			ps[i] -= 2;
			ps[fr] += 2;
			res ++;
		}
	}
	return res + dif;
}
int Calc(int i, int dif){
	if(i > n)
		i -= n;
	return Solve(i, i + n, dif);
}

int df[N];

int main(){
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin >> n >> m;
	int a, b, c;
	for(int i = 0; i < m; i++){
		cin >> a >> b >> c;
		assert(c == 1);
		if(a > b) swap(a, b);
		df[a] ++;
		df[b] --;
		
		Add_Edge(a, b);
		Add_Edge(b, n + a);
		Add_Edge(n + a, n + b);
	}
	for(int i = 1; i <= n; i++) df[i] += df[i - 1];
	int id_mx = max_element(df + 1, df + n) - df;
	id_mx ++;
	int ans = min(Calc(id_mx, 0), Calc(id_mx, 1));
	
	cout << ans << '\n';
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 35 / 35
• Subtask 3: 20 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 15