oj.uz

답안 #1071592

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1071592 2024-08-23T09:10:17 Z Gromp15 Sky Walking (IOI19_walk) C++17
0 / 100
 1824 ms 216060 KB 
#include <bits/stdc++.h>
#define ll long long
#define ar array
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#include "walk.h"
using namespace std;
template<typename T> bool ckmin(T &a, const T &b) { return a > b ? a = b, 1 : 0; }
template<typename T> bool ckmax(T &a, const T &b) { return a < b ? a = b, 1 : 0; }

const ll INF = 1e18;

struct seg {
	int N; vector<multiset<ll>> tree;
	seg(int n) : N(1<<(__lg(n)+1)), tree(2*N) {}
	void add(int pos, ll x) {
		for (int i = pos + N; i; i >>= 1) {
			tree[i].insert(x);
		}
	}
	void del(int pos, ll x) {
		for (int i = pos + N; i; i >>= 1) {
			tree[i].erase(tree[i].find(x));
		}
	}
	ll query(int node, int nl, int nr, int ql, int qr) {
		if (ql > nr || qr < nl) return INF;
		if (ql <= nl && nr <= qr) return tree[node].size() ? *tree[node].begin() : INF;
		int mid = (nl+nr)/2;
		return min(query(node*2, nl, mid, ql, qr), query(node*2+1, mid+1, nr, ql, qr));
	}
	ll query(int l, int r) {
		return query(1, 0, N-1, l, r);
	}
};

long long min_distance(std::vector<int> x, std::vector<int> h, std::vector<int> l, std::vector<int> r, std::vector<int> y, int s, int g) {
	int n = sz(x), m = sz(l);
	if (s == 0 && g == n-1) {
		vector<ar<int, 3>> lines;
		for (int i = 0; i < m; i++) lines.push_back({l[i], r[i], y[i]});
		if (lines.empty()) {
			return s == g ? 0 : -1;
		}
		sort(all(lines));
		vector<ll> dp(m, INF);
		sort(all(y));
		y.erase(unique(all(y)), y.end());
		const int N = sz(y);
		auto compress = [&](int x) {
			return lower_bound(all(y), x) - y.begin();
		};
		seg st1(N), st2(N);
		for (auto &[l, r, y] : lines) y = compress(y);
		for (int i = 0; i < m; i++) if (lines[i][0] == 0) dp[i] = y[lines[i][2]];
		vector<vector<int>> rem(n);
		int t = 0;
		for (int i = 0; i < m; i++) {
			while (t <= min(n-1, lines[i][0])) {
				for (int x : rem[t]) {
					st1.del(lines[x][2], dp[x] - y[lines[x][2]]);
					st2.del(lines[x][2], dp[x] + y[lines[x][2]]);
				}
				t++;
			}
			ckmin(dp[i], y[lines[i][2]] + st1.query(0, lines[i][2]));
			ckmin(dp[i], -y[lines[i][2]] + st2.query(lines[i][2], N-1));
			st1.add(lines[i][2], dp[i] - y[lines[i][2]]);
			st2.add(lines[i][2], dp[i] + y[lines[i][2]]);
			if (lines[i][1] + 1 < n) rem[lines[i][1]+1].emplace_back(i);
		}
		ll ans = INF;
		for (int i = 0; i < m; i++) if (lines[i][1] == n-1) ckmin(ans, dp[i] + y[lines[i][2]]);
		return ans == INF ? -1 : ans + x[n-1];
	}
	vector<int> idx(n);
	iota(all(idx), 0);
	sort(all(idx), [&](int x, int y) { return h[x] > h[y]; });
	vector<int> idx2(m);
	iota(all(idx2), 0);
	sort(all(idx2), [&](int X, int Y) { return y[X] > y[Y]; });
	set<int> who;
	vector<ar<int, 3>> edges;
	for (int i = 0, on = 0; i < m; i++) {
		int L = l[idx2[i]], R = r[idx2[i]], H = y[idx2[i]];
		while (on < n && h[idx[on]] >= H) {
			who.insert(idx[on++]);
		}
		int lst = -1;
		auto it1 = who.lower_bound(L);
		if (it1 == who.end() || *it1 > R) continue;
		lst = *it1;
		while (1) {
			auto it = who.upper_bound(lst);
			if (it == who.end() || *it > R) break;
			edges.push_back({lst, *it, H});
			lst = *it;
		}
	}
	vector<vector<int>> nodes(n);
	vector<map<int, vector<int>>> adj(n);
	for (auto [l, r, H] : edges) {
		nodes[l].emplace_back(H);
		nodes[r].emplace_back(H);
		adj[l][H].push_back(r);
		adj[r][H].push_back(l);
	}
	nodes[s].emplace_back(0);
	nodes[g].emplace_back(0);
	for (int i = 0; i < n; i++) {
		sort(all(nodes[i]));
		nodes[i].erase(unique(all(nodes[i])), nodes[i].end());
	}
	vector<map<int, ll>> dist(n);
	dist[s][0] = 0;
	priority_queue<ar<ll, 3>, vector<ar<ll, 3>>, greater<ar<ll, 3>>> q;
	q.push({0, s, 0});
	auto rlx = [&](int v1, int x1, int v2, int x2) {
		ll new_dist = dist[v1][x1] + abs(x[v1] - x[v2]) + abs(x1 - x2);
		if (!dist[v2].count(x2) || dist[v2][x2] > new_dist) {
			dist[v2][x2] = new_dist;
			q.push({dist[v2][x2], v2, x2});
		}
	};
	while (q.size()) {
		auto [cost, v, i] = q.top(); q.pop();
		if (cost != dist[v][i]) continue;
		auto it = upper_bound(all(nodes[v]), i);
		if (it != nodes[v].end() && *it <= h[v]) {
			rlx(v, i, v, *it);
		}
		assert(it != nodes[v].begin());
		it--;
		if (it != nodes[v].begin() && i <= h[v]) {
			rlx(v, i, v, *prev(it));
		}
		for (int x : adj[v][i]) {
			rlx(v, i, x, i);
		}
	}
	return dist[g].count(0) ? dist[g][0] : -1;
}

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 600 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Incorrect 0 ms 348 KB Output isn't correct
17 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1279 ms 140428 KB Output is correct
4 Correct 782 ms 158564 KB Output is correct
5 Correct 367 ms 100088 KB Output is correct
6 Correct 328 ms 89732 KB Output is correct
7 Correct 403 ms 99832 KB Output is correct
8 Correct 1824 ms 179996 KB Output is correct
9 Correct 486 ms 102780 KB Output is correct
10 Correct 1244 ms 216060 KB Output is correct
11 Correct 409 ms 77124 KB Output is correct
12 Incorrect 198 ms 36300 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 31 ms 3288 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 31 ms 3288 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 43.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 600 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Incorrect 0 ms 348 KB Output isn't correct
17 Halted 0 ms 0 KB -