Submission #92858

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
92858	2019-01-05T11:07:44 Z	emil_physmath	Hard route (IZhO17_road)	C++17	52 / 100	2000 ms	59036 KB

road

#include <iostream>
#include <stdio.h>
#include <vector>
#include <cstring>
using namespace std;
const int MAXN=500005;

vector<int> nei[MAXN];
pair<int, int> maxdist[MAXN];
bool used[MAXN];

void MaxDist(int u);
pair<int, int> DFS(int u, int dep, int dist);
int main()
{
	int n;
	cin>>n;
	for (int i=1; i<n; i++)
	{
		int u, v;
		scanf("%d%d", &u, &v);
		nei[u].push_back(v);
		nei[v].push_back(u);
	}
	pair<int, int> ans(0, 0);
	for (int u=1; u<=n; u++)
		if (nei[u].size()==1)
		{
			memset(used+1, 0, n*sizeof(bool));
			MaxDist(u);
			memset(used+1, 0, n*sizeof(bool));
			pair<int, int> curAns=DFS(u, 0, 0);
			if (curAns.first>ans.first) ans=curAns;
			else if (curAns.first==ans.first) ans.second+=curAns.second;
		}
	cout<<ans.first<<' '<<ans.second/2<<'\n';

	char I;
	cin >> I;
	return 0;
}

pair<int, int> DFS(int u, int dep, int dist)
{
	used[u]=true;
	if (nei[u].size()==1 && used[nei[u][0]])
		return make_pair(dep*dist, 1);
	pair<int, int> ans(0, 0);
	for (int i=0; i<nei[u].size(); i++)
	{
		int to=nei[u][i];
		if (!used[to])
		{
			pair<int, int> curAns;
			if (maxdist[u].first==maxdist[to].first+1)
				curAns=DFS(to, dep+1, max(dist, maxdist[u].second));
			else
				curAns=DFS(to, dep+1, max(dist, maxdist[u].first));

			if (curAns.first>ans.first) ans=curAns;
			else if (curAns.first==ans.first) ans.second+=curAns.second;
		}
	}
	return ans;
}

void MaxDist(int u)
{
	used[u]=true;
	maxdist[u]=make_pair(0, 0);
	if (nei[u].size()==1 && used[nei[u][0]]) return;
	for (int i=0; i<nei[u].size(); i++)
	{
		int to=nei[u][i];
		if (!used[to])
		{
			MaxDist(to);
			int temp=maxdist[to].first+1;
			if (temp>maxdist[u].first)
			{
				swap(maxdist[u].first, maxdist[u].second);
				maxdist[u].first=temp;
			}
			else if (temp>maxdist[u].second)
				maxdist[u].second=temp;
		}
	}
}

Compilation message

road.cpp: In function 'std::pair<int, int> DFS(int, int, int)':
road.cpp:49:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0; i<nei[u].size(); i++)
                ~^~~~~~~~~~~~~~
road.cpp: In function 'void MaxDist(int)':
road.cpp:72:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0; i<nei[u].size(); i++)
                ~^~~~~~~~~~~~~~
road.cpp: In function 'int main()':
road.cpp:21:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &u, &v);
   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
19.0 / 19.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	10 ms	12024 KB	Output is correct
2	Correct	10 ms	12024 KB	Output is correct
3	Correct	13 ms	12024 KB	Output is correct
4	Correct	10 ms	12024 KB	Output is correct
5	Correct	10 ms	12024 KB	Output is correct
6	Correct	10 ms	12024 KB	Output is correct
7	Correct	10 ms	12024 KB	Output is correct
8	Correct	10 ms	12024 KB	Output is correct
9	Correct	10 ms	12024 KB	Output is correct
10	Correct	10 ms	12044 KB	Output is correct
11	Correct	12 ms	12152 KB	Output is correct
12	Correct	10 ms	12152 KB	Output is correct
13	Correct	11 ms	12152 KB	Output is correct
14	Correct	12 ms	12024 KB	Output is correct
15	Correct	10 ms	12024 KB	Output is correct
16	Correct	12 ms	12152 KB	Output is correct
17	Correct	10 ms	12024 KB	Output is correct
18	Correct	12 ms	12024 KB	Output is correct
19	Correct	10 ms	12152 KB	Output is correct
20	Correct	12 ms	12024 KB	Output is correct
21	Correct	12 ms	12024 KB	Output is correct
22	Correct	11 ms	12152 KB	Output is correct
23	Correct	10 ms	12024 KB	Output is correct
24	Correct	10 ms	12152 KB	Output is correct

Subtask #2
33.0 / 33.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	10 ms	12024 KB	Output is correct
2	Correct	10 ms	12024 KB	Output is correct
3	Correct	13 ms	12024 KB	Output is correct
4	Correct	10 ms	12024 KB	Output is correct
5	Correct	10 ms	12024 KB	Output is correct
6	Correct	10 ms	12024 KB	Output is correct
7	Correct	10 ms	12024 KB	Output is correct
8	Correct	10 ms	12024 KB	Output is correct
9	Correct	10 ms	12024 KB	Output is correct
10	Correct	10 ms	12044 KB	Output is correct
11	Correct	12 ms	12152 KB	Output is correct
12	Correct	10 ms	12152 KB	Output is correct
13	Correct	11 ms	12152 KB	Output is correct
14	Correct	12 ms	12024 KB	Output is correct
15	Correct	10 ms	12024 KB	Output is correct
16	Correct	12 ms	12152 KB	Output is correct
17	Correct	10 ms	12024 KB	Output is correct
18	Correct	12 ms	12024 KB	Output is correct
19	Correct	10 ms	12152 KB	Output is correct
20	Correct	12 ms	12024 KB	Output is correct
21	Correct	12 ms	12024 KB	Output is correct
22	Correct	11 ms	12152 KB	Output is correct
23	Correct	10 ms	12024 KB	Output is correct
24	Correct	10 ms	12152 KB	Output is correct
25	Correct	312 ms	12536 KB	Output is correct
26	Correct	295 ms	12536 KB	Output is correct
27	Correct	299 ms	12664 KB	Output is correct
28	Correct	289 ms	12556 KB	Output is correct
29	Correct	361 ms	12580 KB	Output is correct
30	Correct	352 ms	12536 KB	Output is correct
31	Correct	350 ms	12664 KB	Output is correct
32	Correct	369 ms	12536 KB	Output is correct
33	Correct	17 ms	12536 KB	Output is correct
34	Correct	17 ms	12664 KB	Output is correct
35	Correct	17 ms	12668 KB	Output is correct
36	Correct	16 ms	12664 KB	Output is correct
37	Correct	14 ms	12664 KB	Output is correct
38	Correct	16 ms	12664 KB	Output is correct
39	Correct	16 ms	12408 KB	Output is correct
40	Correct	18 ms	12412 KB	Output is correct
41	Correct	22 ms	12408 KB	Output is correct
42	Correct	33 ms	12408 KB	Output is correct
43	Correct	50 ms	12412 KB	Output is correct
44	Correct	83 ms	12280 KB	Output is correct
45	Correct	159 ms	12280 KB	Output is correct
46	Correct	167 ms	12280 KB	Output is correct
47	Correct	400 ms	12404 KB	Output is correct
48	Correct	419 ms	12536 KB	Output is correct

Subtask #3
0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	10 ms	12024 KB	Output is correct
2	Correct	10 ms	12024 KB	Output is correct
3	Correct	13 ms	12024 KB	Output is correct
4	Correct	10 ms	12024 KB	Output is correct
5	Correct	10 ms	12024 KB	Output is correct
6	Correct	10 ms	12024 KB	Output is correct
7	Correct	10 ms	12024 KB	Output is correct
8	Correct	10 ms	12024 KB	Output is correct
9	Correct	10 ms	12024 KB	Output is correct
10	Correct	10 ms	12044 KB	Output is correct
11	Correct	12 ms	12152 KB	Output is correct
12	Correct	10 ms	12152 KB	Output is correct
13	Correct	11 ms	12152 KB	Output is correct
14	Correct	12 ms	12024 KB	Output is correct
15	Correct	10 ms	12024 KB	Output is correct
16	Correct	12 ms	12152 KB	Output is correct
17	Correct	10 ms	12024 KB	Output is correct
18	Correct	12 ms	12024 KB	Output is correct
19	Correct	10 ms	12152 KB	Output is correct
20	Correct	12 ms	12024 KB	Output is correct
21	Correct	12 ms	12024 KB	Output is correct
22	Correct	11 ms	12152 KB	Output is correct
23	Correct	10 ms	12024 KB	Output is correct
24	Correct	10 ms	12152 KB	Output is correct
25	Correct	312 ms	12536 KB	Output is correct
26	Correct	295 ms	12536 KB	Output is correct
27	Correct	299 ms	12664 KB	Output is correct
28	Correct	289 ms	12556 KB	Output is correct
29	Correct	361 ms	12580 KB	Output is correct
30	Correct	352 ms	12536 KB	Output is correct
31	Correct	350 ms	12664 KB	Output is correct
32	Correct	369 ms	12536 KB	Output is correct
33	Correct	17 ms	12536 KB	Output is correct
34	Correct	17 ms	12664 KB	Output is correct
35	Correct	17 ms	12668 KB	Output is correct
36	Correct	16 ms	12664 KB	Output is correct
37	Correct	14 ms	12664 KB	Output is correct
38	Correct	16 ms	12664 KB	Output is correct
39	Correct	16 ms	12408 KB	Output is correct
40	Correct	18 ms	12412 KB	Output is correct
41	Correct	22 ms	12408 KB	Output is correct
42	Correct	33 ms	12408 KB	Output is correct
43	Correct	50 ms	12412 KB	Output is correct
44	Correct	83 ms	12280 KB	Output is correct
45	Correct	159 ms	12280 KB	Output is correct
46	Correct	167 ms	12280 KB	Output is correct
47	Correct	400 ms	12404 KB	Output is correct
48	Correct	419 ms	12536 KB	Output is correct
49	Execution timed out	2067 ms	59036 KB	Time limit exceeded
50	Halted	0 ms	0 KB	-

Submission #92858

Compilation message

Subtask #1 19.0 / 19.0

Subtask #2 33.0 / 33.0

Subtask #3 0 / 48.0

Subtask #1
19.0 / 19.0

Subtask #2
33.0 / 33.0

Subtask #3
0 / 48.0