oj.uz

Submission #807023

# Submission time Handle Problem Language Result Execution time Memory
807023 2023-08-04T12:27:35 Z math_rabbit_1028 Sky Walking (IOI19_walk) C++14
33 / 100
 243 ms 32028 KB 
#include "walk.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int n, m, s, g;
vector<int> x, h, l, r, y;

struct sky {
	int lt, rt, val;
} walk[101010];
bool compare(sky a, sky b) {
	if (a.rt == b.rt) return a.lt > b.lt;
	return a.rt < b.rt;
}
void sort_end() {
	for (int i = 0; i < m; i++) walk[i] = {l[i], r[i], y[i]};
	sort(walk, walk + m, compare);
	for (int i = 0; i < m; i++) {
		l[i] = walk[i].lt;
		r[i] = walk[i].rt;
		y[i] = walk[i].val;
	}
}

vector<int> up, dn;
set< pair<int, int> > pset, mset;
vector<int> add[101010], rem[101010];
void get_updn() {
	for (int i = 0; i < m; i++) add[l[i]].push_back(i);
	for (int i = 0; i < m; i++) rem[r[i] + 1].push_back(i);

	int p = 0;
	for (int i = 0; i < m; i++) {
		while (p <= r[i]) {
			for (int j = 0; j < add[p].size(); j++) {
				int tar = add[p][j];
				pset.insert({y[tar], tar});
				mset.insert({-y[tar], tar});
			}
			for (int j = 0; j < rem[p].size(); j++) {
				int tar = rem[p][j];
				pset.erase({y[tar], tar});
				mset.erase({-y[tar], tar});
			}
			p++;
		}

		if (pset.lower_bound({y[i], i + 1}) == pset.end()) up.push_back(-1);
		else up.push_back(pset.lower_bound({y[i], i + 1})->second);
		if (mset.lower_bound({-y[i], i + 1}) == mset.end()) dn.push_back(-1);
		else dn.push_back(mset.lower_bound({-y[i], i + 1})->second);
	}
}

vector< pair<int, ll> > adj[101010];
void get_edge() {
	for (int i = 0; i < m; i++) {
		adj[i].push_back({up[i], y[up[i]] - y[i]});
		adj[i].push_back({dn[i], y[i] - y[dn[i]]});
	}
	for (int i = 0; i < m; i++) {
		if (l[i] == 0) adj[m].push_back({i, y[i]});
		if (r[i] == n - 1) adj[i].push_back({m + 1, y[i]});
	}
}

ll dis[101010];
priority_queue< pair<ll, int> > pq;
void dijkstra() {
	for (int i = 0; i <= m + 1; i++) dis[i] = 1e18;
	dis[m] = 0;
	pq.push({-dis[m], m});
	while (!pq.empty()) {
		int now = pq.top().second; ll nowdis = -pq.top().first;
		pq.pop();
		for (int i = 0; i < adj[now].size(); i++) {
			int next = adj[now][i].first;
			if (dis[next] > nowdis + adj[now][i].second) {
				dis[next] = nowdis + adj[now][i].second;
				pq.push({-dis[next], next});
			}
		}
	}
}

ll 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) {
	x = X; h = H; l = L; r = R; y = Y; s = S; g = G;
	n = x.size();
	m = l.size();
	sort_end();
	//for (int i = 0; i < m; i++) cout << l[i] << " " << r[i] << " " << y[i] << "\n";
	//cout << "\n";

	get_updn();
	//for (int i = 0; i < m; i++) cout << up[i] << " "; 
	//cout << "\n";
	//for (int i = 0; i < m; i++) cout << dn[i] << " "; 
	//cout << "\n";

	get_edge();

	dijkstra();

	ll ans = dis[m + 1];
	if (ans >= 1e18) return -1;
	ans = ans + x[n - 1] - x[0];
	return ans;
}

Compilation message

walk.cpp: In function 'void get_updn()':
walk.cpp:36:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |    for (int j = 0; j < add[p].size(); j++) {
      |                    ~~^~~~~~~~~~~~~~~
walk.cpp:41:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |    for (int j = 0; j < rem[p].size(); j++) {
      |                    ~~^~~~~~~~~~~~~~~
walk.cpp: In function 'void dijkstra()':
walk.cpp:77:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |   for (int i = 0; i < adj[now].size(); i++) {
      |                   ~~^~~~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 7380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 7380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 13764 KB Output is correct
2 Correct 146 ms 19524 KB Output is correct
3 Correct 155 ms 19980 KB Output is correct
4 Correct 165 ms 24656 KB Output is correct
5 Correct 243 ms 27164 KB Output is correct
6 Correct 196 ms 27540 KB Output is correct
7 Correct 73 ms 18080 KB Output is correct
8 Correct 81 ms 26904 KB Output is correct
9 Correct 190 ms 31872 KB Output is correct
10 Correct 123 ms 27672 KB Output is correct
11 Correct 11 ms 8532 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 13764 KB Output is correct
2 Correct 146 ms 19524 KB Output is correct
3 Correct 155 ms 19980 KB Output is correct
4 Correct 165 ms 24656 KB Output is correct
5 Correct 243 ms 27164 KB Output is correct
6 Correct 196 ms 27540 KB Output is correct
7 Correct 73 ms 18080 KB Output is correct
8 Correct 81 ms 26904 KB Output is correct
9 Correct 190 ms 31872 KB Output is correct
10 Correct 123 ms 27672 KB Output is correct
11 Correct 11 ms 8532 KB Output is correct
12 Correct 144 ms 20016 KB Output is correct
13 Correct 181 ms 24708 KB Output is correct
14 Correct 208 ms 27064 KB Output is correct
15 Correct 141 ms 23940 KB Output is correct
16 Correct 120 ms 23972 KB Output is correct
17 Correct 129 ms 23932 KB Output is correct
18 Correct 120 ms 23972 KB Output is correct
19 Correct 125 ms 23976 KB Output is correct
20 Correct 84 ms 18328 KB Output is correct
21 Correct 26 ms 10020 KB Output is correct
22 Correct 108 ms 21576 KB Output is correct
23 Correct 102 ms 22080 KB Output is correct
24 Correct 106 ms 22908 KB Output is correct
25 Correct 95 ms 21880 KB Output is correct
26 Correct 97 ms 23592 KB Output is correct
27 Correct 217 ms 27060 KB Output is correct
28 Correct 129 ms 24488 KB Output is correct
29 Correct 211 ms 27560 KB Output is correct
30 Correct 75 ms 18160 KB Output is correct
31 Correct 194 ms 32028 KB Output is correct
32 Correct 99 ms 25480 KB Output is correct
33 Correct 101 ms 25848 KB Output is correct
34 Correct 113 ms 28084 KB Output is correct
35 Correct 100 ms 25716 KB Output is correct
36 Correct 83 ms 25284 KB Output is correct
37 Correct 72 ms 24768 KB Output is correct
38 Correct 76 ms 26892 KB Output is correct
39 Correct 139 ms 31936 KB Output is correct
40 Correct 75 ms 26144 KB Output is correct
41 Correct 75 ms 25208 KB Output is correct

Subtask #5
0 / 43.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 7380 KB Output isn't correct
2 Halted 0 ms 0 KB -