Submission #200062

#	Time	Username	Problem	Language	Result	Execution time	Memory
200062		maruii	Arranging Tickets (JOI17_arranging_tickets)	C++14	85 / 100	6040 ms	12272 KiB

arranging_tickets

#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
using ll = long long;
#define ff first
#define ss second

int N, M, L, R;
ll A[200005], X[200005], mx, S[200005];
vector<pii> V[200005];
bool g(int m, int n, int p) {
	fill(S, S + N + 1, 0);
	priority_queue<pii> pq;
	ll s = 0;
	for (int i = 1; i <= p; ++i) {
		for (auto j : V[i]) if (j.ff > p) pq.push(j);
		while (s < X[i]) {
			if (pq.empty()) return 0;
			auto t = pq.top(); pq.pop();
			if (s + t.ss <= X[i]) {
				S[t.ff] += t.ss;
				s += t.ss;
			}
			else {
				S[t.ff] += X[i] - s;
				t.ss -= X[i] - s;
				s = X[i];
				pq.push(t);
			}
		}
	}
	for (int i = p + 1; i <= N; ++i) {
		s -= S[i];
		if (A[i] - s + n - s > m) return 0;
	}
	return 1;
}
bool f(int m) {
	for (int n = mx - m; n <= mx - m + 1; ++n) {
		for (int i = 1; i <= R; ++i) X[i] = (A[i] + n - m + 1) / 2;
		if (g(m, n, L)) return 1;
	}
	return 0;
}
int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> N >> M;
	for (int i = 1; i <= M; ++i) {
		int a, b, c; cin >> a >> b >> c;
		if (a > b) swap(a, b);
		A[a] += c;
		A[b] -= c;
		V[a].emplace_back(b, c);
	}
	for (int i = 1; i <= N; ++i) A[i] += A[i - 1];
	mx = *max_element(A + 1, A + N + 1);
	for (int i = 1; i <= N; ++i) if (mx == A[i]) {
		L = i;
		break;
	}
	for (int i = N; i >= 1; --i) if (mx == A[i]) {
		R = i;
		break;
	}
	int l = 1, r = mx;
	while (l < r) {
		int m = l + r >> 1;
		if (f(m)) r = m;
		else l = m + 1;
	}
	cout << l;
	return 0;
 }

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