oj.uz

Submission #93015

# Submission time Handle Problem Language Result Execution time Memory
93015 2019-01-06T09:57:46 Z davitmarg Hard route (IZhO17_road) C++17
19 / 100
 2000 ms 131192 KB 
/*
DEATH-MATCH
Davit-Marg
*/
#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <string>
#include <cstring>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <stack>
#include <iterator>
#include <ctype.h>
#include <stdlib.h>  
#include <cassert>
#include <fstream>  
#define mod 1000000007ll
#define LL long long
#define LD long double
#define MP make_pair
#define PB push_back
using namespace std;

const int N = 5003;

int n,used[N][N],st;
vector<int> g[N],ord;
pair<LL, LL> dp[N][N];
LL  best;
map<LL, int> u;
void dfsinit(int v)
{
	used[st][v] = 1;
	for (int i = 0; i < g[v].size(); i++)
	{
		int to = g[v][i];
		if (used[st][to] == 1)
			continue;
		dfsinit(to);
		if (dp[st][to].first + 1 >= dp[st][v].first)
		{
			dp[st][v].second = dp[st][v].first;
			dp[st][v].first = dp[st][to].first + 1;
		}
		else if (dp[st][to].first + 1 >= dp[st][v].second)
			dp[st][v].second = dp[st][to].first + 1;
	}
}

void dfs(int v, LL d = 0, LL h = 0)
{
	used[st][v] = 2;
	if (g[v].size() == 1 && st!=v)
	{
		best = max(best, h*d);
		u[h*d]++;
	}
	for (int i = 0; i < g[v].size(); i++)
	{
		int to = g[v][i];
		if (used[st][to]==2)
			continue;
		LL H;
		if (dp[st][to].first + 1 == dp[st][v].first)
			H = max(h,dp[st][v].second);
		else
			H = max(h, dp[st][v].first);
		dfs(to,d+1,H);
	}
}

int main()
{
	cin >> n;
	for (int i = 0; i < n-1; i++)
	{
		int a, b;
		cin >> a >> b;
		g[a].PB(b);
		g[b].PB(a);
	}
	for (st = 1; st <= n; st++)
		if(g[st].size()==1)
		{
			dfsinit(st);
			dfs(st);
		}
	cout << best << " " << u[best] / 2 << endl;
	return 0;
}

/*


*/

Compilation message

road.cpp: In function 'void dfsinit(int)':
road.cpp:38:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < g[v].size(); i++)
                  ~~^~~~~~~~~~~~~
road.cpp: In function 'void dfs(int, long long int, long long int)':
road.cpp:62:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < g[v].size(); i++)
                  ~~^~~~~~~~~~~~~

Subtask #1
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 504 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 504 KB Output is correct
6 Correct 2 ms 504 KB Output is correct
7 Correct 2 ms 764 KB Output is correct
8 Correct 2 ms 632 KB Output is correct
9 Correct 2 ms 760 KB Output is correct
10 Correct 2 ms 760 KB Output is correct
11 Correct 2 ms 892 KB Output is correct
12 Correct 3 ms 1016 KB Output is correct
13 Correct 4 ms 1016 KB Output is correct
14 Correct 2 ms 1020 KB Output is correct
15 Correct 2 ms 504 KB Output is correct
16 Correct 2 ms 504 KB Output is correct
17 Correct 2 ms 504 KB Output is correct
18 Correct 2 ms 504 KB Output is correct
19 Correct 2 ms 504 KB Output is correct
20 Correct 2 ms 504 KB Output is correct
21 Correct 2 ms 504 KB Output is correct
22 Correct 2 ms 504 KB Output is correct
23 Correct 2 ms 632 KB Output is correct
24 Correct 3 ms 1400 KB Output is correct

Subtask #2
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 504 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 504 KB Output is correct
6 Correct 2 ms 504 KB Output is correct
7 Correct 2 ms 764 KB Output is correct
8 Correct 2 ms 632 KB Output is correct
9 Correct 2 ms 760 KB Output is correct
10 Correct 2 ms 760 KB Output is correct
11 Correct 2 ms 892 KB Output is correct
12 Correct 3 ms 1016 KB Output is correct
13 Correct 4 ms 1016 KB Output is correct
14 Correct 2 ms 1020 KB Output is correct
15 Correct 2 ms 504 KB Output is correct
16 Correct 2 ms 504 KB Output is correct
17 Correct 2 ms 504 KB Output is correct
18 Correct 2 ms 504 KB Output is correct
19 Correct 2 ms 504 KB Output is correct
20 Correct 2 ms 504 KB Output is correct
21 Correct 2 ms 504 KB Output is correct
22 Correct 2 ms 504 KB Output is correct
23 Correct 2 ms 632 KB Output is correct
24 Correct 3 ms 1400 KB Output is correct
25 Correct 521 ms 130524 KB Output is correct
26 Correct 516 ms 129784 KB Output is correct
27 Correct 526 ms 131192 KB Output is correct
28 Correct 533 ms 130296 KB Output is correct
29 Execution timed out 2062 ms 128260 KB Time limit exceeded
30 Halted 0 ms 0 KB -

Subtask #3
0 / 48.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 504 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 504 KB Output is correct
6 Correct 2 ms 504 KB Output is correct
7 Correct 2 ms 764 KB Output is correct
8 Correct 2 ms 632 KB Output is correct
9 Correct 2 ms 760 KB Output is correct
10 Correct 2 ms 760 KB Output is correct
11 Correct 2 ms 892 KB Output is correct
12 Correct 3 ms 1016 KB Output is correct
13 Correct 4 ms 1016 KB Output is correct
14 Correct 2 ms 1020 KB Output is correct
15 Correct 2 ms 504 KB Output is correct
16 Correct 2 ms 504 KB Output is correct
17 Correct 2 ms 504 KB Output is correct
18 Correct 2 ms 504 KB Output is correct
19 Correct 2 ms 504 KB Output is correct
20 Correct 2 ms 504 KB Output is correct
21 Correct 2 ms 504 KB Output is correct
22 Correct 2 ms 504 KB Output is correct
23 Correct 2 ms 632 KB Output is correct
24 Correct 3 ms 1400 KB Output is correct
25 Correct 521 ms 130524 KB Output is correct
26 Correct 516 ms 129784 KB Output is correct
27 Correct 526 ms 131192 KB Output is correct
28 Correct 533 ms 130296 KB Output is correct
29 Execution timed out 2062 ms 128260 KB Time limit exceeded
30 Halted 0 ms 0 KB -