oj.uz

Submission #831135

# Submission time Handle Problem Language Result Execution time Memory
831135 2023-08-19T19:22:10 Z PurpleCrayon Sky Walking (IOI19_walk) C++17
15 / 100
 151 ms 25440 KB 
#include "walk.h"
#include <bits/stdc++.h>
using namespace std;

#define sz(v) int(v.size())
#define ar array
typedef long long ll;
const int N = 1e5+10;
const ll INF = 1e18+10;

template <class T>
using min_pq = priority_queue<T, vector<T>, greater<T>>;

int n, m;
vector<pair<int, int>> adj[N];
ll dist[N];

void add_edge(int a, int b, int w) {
	adj[a].emplace_back(b, w);
	adj[b].emplace_back(a, w);
}

void dijkstra(int S) {
	fill(dist, dist + N, INF);

	min_pq<pair<ll, int>> pq;
	pq.push({dist[S] = 0, S});

	while (!pq.empty()) {
		auto [d_c, c] = pq.top(); pq.pop();
		if (dist[c] != d_c) continue;
		for (auto [nxt, w] : adj[c]) {
			if (dist[nxt] > dist[c] + w) {
				dist[nxt] = dist[c] + w;
				pq.push({dist[nxt], nxt});
			}
		}
	}
}

long long min_distance(vector<int> x, vector<int> h, vector<int> l, vector<int> r, vector<int> y, int s, int g) {
	n = sz(x), m = sz(l);
	assert(s == 0 && g == n-1);

	auto build = [&]() {
		vector<vector<int>> ev(n);
		for (int i = 0; i < m; i++) {
			ev[l[i]].push_back(i);
			ev[r[i]].push_back(i);
		}

		vector<bool> on(m);
		set<pair<int, int>> s;
		for (int i = 0; i < n; i++) {
			for (int x : ev[i]) if (!on[x]) {
				auto me = s.insert({y[x], x}).first;

				{
					auto it = next(me);
					if (it != s.end() && it->first <= h[i]) {
						add_edge(x, it->second, it->first - y[x]);
					}
				}

				{
					if (me != s.begin()) {
						auto it = prev(me);
						add_edge(x, it->second, y[x] - it->first);
					}
				}
			}

			for (int x : ev[i]) if (on[x]) {
				s.erase({y[x], x});
			}

			for (int x : ev[i]) on[x] = !on[x];
		}
	};

	build();
	int S = m+1;
	for (int i = 0; i < m; i++) if (l[i] == 0) {
		add_edge(S, i, y[i]);
	}
	dijkstra(S);

	ll ans = INF;
	for (int i = 0; i < m; i++) if (r[i] == n-1) {
		ans = min(ans, dist[i] + y[i]);
	}

	// cerr << x[n-1] - x[0] << ' ' << ans << endl;
	if (ans == INF) return -1;
	return ans + x[n-1] - x[0];
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 5204 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 5204 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 37 ms 8116 KB Output is correct
2 Correct 84 ms 12548 KB Output is correct
3 Correct 94 ms 12812 KB Output is correct
4 Correct 122 ms 17308 KB Output is correct
5 Correct 146 ms 21396 KB Output is correct
6 Correct 151 ms 18788 KB Output is correct
7 Correct 58 ms 12692 KB Output is correct
8 Correct 68 ms 15120 KB Output is correct
9 Correct 141 ms 24100 KB Output is correct
10 Correct 96 ms 20472 KB Output is correct
11 Correct 10 ms 5332 KB Output is correct

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 37 ms 8116 KB Output is correct
2 Correct 84 ms 12548 KB Output is correct
3 Correct 94 ms 12812 KB Output is correct
4 Correct 122 ms 17308 KB Output is correct
5 Correct 146 ms 21396 KB Output is correct
6 Correct 151 ms 18788 KB Output is correct
7 Correct 58 ms 12692 KB Output is correct
8 Correct 68 ms 15120 KB Output is correct
9 Correct 141 ms 24100 KB Output is correct
10 Correct 96 ms 20472 KB Output is correct
11 Correct 10 ms 5332 KB Output is correct
12 Correct 100 ms 15124 KB Output is correct
13 Correct 112 ms 21244 KB Output is correct
14 Correct 147 ms 25440 KB Output is correct
15 Correct 101 ms 20180 KB Output is correct
16 Correct 119 ms 21032 KB Output is correct
17 Correct 103 ms 20860 KB Output is correct
18 Correct 100 ms 20212 KB Output is correct
19 Correct 114 ms 20980 KB Output is correct
20 Correct 67 ms 15696 KB Output is correct
21 Correct 20 ms 8676 KB Output is correct
22 Correct 80 ms 19156 KB Output is correct
23 Correct 82 ms 19320 KB Output is correct
24 Correct 74 ms 18448 KB Output is correct
25 Correct 74 ms 18760 KB Output is correct
26 Correct 69 ms 19328 KB Output is correct
27 Correct 151 ms 25084 KB Output is correct
28 Correct 110 ms 21324 KB Output is correct
29 Correct 137 ms 22764 KB Output is correct
30 Correct 60 ms 15660 KB Output is correct
31 Correct 142 ms 24040 KB Output is correct
32 Correct 79 ms 17928 KB Output is correct
33 Incorrect 86 ms 19056 KB Output isn't correct
34 Halted 0 ms 0 KB -

Subtask #5
0 / 43.0

# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 5204 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -