oj.uz

Submission #427770

# Submission time Handle Problem Language Result Execution time Memory
427770 2021-06-14T22:01:12 Z albertolg101 Sky Walking (IOI19_walk) C++17
10 / 100
 4000 ms 527088 KB 
#include <bits/stdc++.h>
#include "walk.h"

using namespace std; 
using ll = long long;
using pii = pair<int, int>;

const ll INFLL = 1e18;

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 start, int end) {

	int n = x.size(), 
		m = y.size();

	vector<pii> cc;
	vector<vector<int>> skywalk(n);
	cc.push_back({start, 0});
	cc.push_back({end, 0});
	skywalk[start].push_back(0);
	skywalk[end].push_back(0);

	for(int i = 0 ; i < m ; i++)
	{
		for(int j = L[i] ; j <= R[i] ; j++)
		{
			if(h[j] >= y[i])
			{
				cc.push_back({j, y[i]});
				skywalk[j].push_back(y[i]);
			}
		}
	}

	sort(cc.begin(), cc.end());
	cc.resize(unique(cc.begin(), cc.end()) - cc.begin());
	
	vector<vector<pair<int, ll>>> g(cc.size());

	for(int i = 0 ; i < n ; i++)
	{
		sort(skywalk[i].begin(), skywalk[i].end());

		for(int j = 0 ; j + 1 < skywalk[i].size() ; j++)
		{
			int a = lower_bound(cc.begin(), cc.end(), (pii){i, skywalk[i][j]}) - cc.begin(), 
				b = lower_bound(cc.begin(), cc.end(), (pii){i, skywalk[i][j+1]}) - cc.begin();
			ll w = skywalk[i][j+1] - skywalk[i][j];

			g[a].push_back({b, w});
			g[b].push_back({a, w});
		}
	}

	for(int i = 0 ; i < m ; i++)
	{
		int a = -1;
		for(int j = L[i] ; j <= R[i] ; j++)
		{
			if(h[j] >= y[i])
			{
				if(a == -1)
				{
					a = lower_bound(cc.begin(), cc.end(), (pii){j, y[i]}) - cc.begin();
				}

				else
				{
					int b = lower_bound(cc.begin(), cc.end(), (pii){j, y[i]}) - cc.begin(); 
					ll w = x[cc[b].first] - x[cc[a].first];

					g[a].push_back({b, w});
					g[b].push_back({a, w});

					a = b;
				}
			}
		}
	}

	priority_queue<pair<ll, int>> q;
	int s = lower_bound(cc.begin(), cc.end(), (pii){start, 0}) - cc.begin();
	q.push({0, s});

	vector<bool> flag(cc.size());
	vector<ll> dp(cc.size(), INFLL);
	dp[s] = 0;

	while(q.size())
	{
		int nod = q.top().second;
		q.pop();

		if(flag[nod])
			continue;

		flag[nod] = true;

		for(auto i: g[nod])
		{
			if(dp[i.first] > dp[nod] + i.second)
			{
				dp[i.first] = dp[nod] + i.second;
				q.push({-dp[i.first], i.first});
			}
		}
	}

	int e = lower_bound(cc.begin(), cc.end(), (pii){end, 0}) - cc.begin();
	return (dp[e] == INFLL ? -1 : dp[e]);
}

Compilation message

walk.cpp: In function 'long long int min_distance(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, int, int)':
walk.cpp:43:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |   for(int j = 0 ; j + 1 < skywalk[i].size() ; j++)
      |                   ~~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 3 ms 332 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 332 KB Output is correct

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1203 ms 99704 KB Output is correct
4 Correct 1030 ms 103328 KB Output is correct
5 Correct 813 ms 88516 KB Output is correct
6 Correct 2115 ms 78080 KB Output is correct
7 Correct 740 ms 88664 KB Output is correct
8 Correct 1564 ms 126556 KB Output is correct
9 Correct 822 ms 88792 KB Output is correct
10 Correct 1548 ms 144352 KB Output is correct
11 Correct 548 ms 52936 KB Output is correct
12 Correct 271 ms 31896 KB Output is correct
13 Correct 1234 ms 126588 KB Output is correct
14 Execution timed out 4043 ms 24964 KB Time limit exceeded
15 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 109 ms 14820 KB Output is correct
2 Execution timed out 4086 ms 527088 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 109 ms 14820 KB Output is correct
2 Execution timed out 4086 ms 527088 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #5
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 3 ms 332 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1203 ms 99704 KB Output is correct
21 Correct 1030 ms 103328 KB Output is correct
22 Correct 813 ms 88516 KB Output is correct
23 Correct 2115 ms 78080 KB Output is correct
24 Correct 740 ms 88664 KB Output is correct
25 Correct 1564 ms 126556 KB Output is correct
26 Correct 822 ms 88792 KB Output is correct
27 Correct 1548 ms 144352 KB Output is correct
28 Correct 548 ms 52936 KB Output is correct
29 Correct 271 ms 31896 KB Output is correct
30 Correct 1234 ms 126588 KB Output is correct
31 Execution timed out 4043 ms 24964 KB Time limit exceeded
32 Halted 0 ms 0 KB -