oj.uz

Submission #101217

# Submission time Handle Problem Language Result Execution time Memory
101217 2019-03-17T14:28:23 Z davitmarg Race (IOI11_race) C++17
31 / 100
 737 ms 30208 KB 
/*DavitMarg*/
#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>

#ifndef death
#include "race.h"
#endif

#define mod 1000000007ll
#define LL long long
#define LD long double
#define MP make_pair
#define PB push_back
#define all(v) v.begin(),v.end()
using namespace std;

int n, k, num[200005], used[200005], usedNum[200005], usedC[200005], wasC[200005], color = 1, cColor = 1, numColor = 1, ans = mod;
vector<pair<int, LL>> g[200005], upd;
vector<int> cl;
int dp[1000006];
void getNum(int v)
{
	usedNum[v] = numColor;
	num[v] = 1;
	for (int i = 0; i < g[v].size(); i++)
	{
		int to = g[v][i].first;
		if (usedNum[to] == numColor || wasC[to])
			continue;
		getNum(to);
		num[v] += num[to];
	}
}

int centroid(int v)
{
	numColor++;
	cColor++;
	getNum(v);
	int st = v;
	queue<int> q;
	q.push(v);
	while (!q.empty())
	{
		v = q.front();
		q.pop();
		usedC[v] = cColor;
		bool is = 1;
		for (int i = 0; i<g[v].size(); i++)
			if (num[g[v][i].first]>num[st] / 2 && usedC[g[v][i].first] != cColor && !wasC[g[v][i].first])
			{
				is = 0;
				q.push(g[v][i].first);
			}
		if (is)
		{
			wasC[v] = 1;
			return v;
		}
	}
}

void dfs(int v, LL sum, int depth)
{
	used[v] = color;

	if (dp[sum] == 0)
		dp[sum] = mod;
	if (k > sum && dp[k - sum] == 0)
		dp[k - sum] = mod;


	if (sum == k)
		ans = min(ans, depth);
	else if (sum < k)
		ans = min(ans, depth + dp[k - sum]);
	else
		return;

	cl.PB(sum);
	upd.PB(MP(depth, sum));

	for (int i = 0; i < g[v].size(); i++)
	{
		int to = g[v][i].first;
		LL D = g[v][i].second;
		if (used[to] == color || wasC[to])
			continue;
		dfs(to, sum + D, depth + 1);
	}
}

void solve(int v)
{
	color++;
	vector<int> nxt;
	for (int i = 0; i < g[v].size(); i++)
	{
		int to = g[v][i].first;
		LL D = g[v][i].second;
		if (used[to] == color || wasC[to])
			continue;

		upd.clear();
		dfs(to, D, 1);
		for (int j = 0; j < upd.size(); j++)
			dp[upd[j].second] = min(dp[upd[j].second], upd[j].first);
		nxt.PB(to);
	}
	while (!cl.empty())
	{
		dp[cl.back()] = 0;
		cl.pop_back();
	}
	for (int i = 0; i < nxt.size(); i++)
		solve(centroid(nxt[i]));
}

int Main()
{
	solve(centroid(1));
	if (ans == mod)
		ans = -1;
	return 0;
}

int best_path(int N, int K, int h[][2], int l[])
{
	n = N;
	k = K;
	for (int i = 0; i < n - 1; i++)
	{
		h[i][0]++;
		h[i][1]++;
		g[h[i][0]].PB(MP(h[i][1], l[i]));
		g[h[i][1]].PB(MP(h[i][0], l[i]));
	}
	Main();
	return ans;
}

#ifdef death
int main()
{
	cin >> n >> k;

	for (int i = 0; i < n - 1; i++)
	{
		int a, b;
		LL D;
		cin >> a >> b >> D;
		/*a = i;
		b = a + 1;
		D = rand() % 20;*/
		a++;
		b++;
		g[a].PB(MP(b, D));
		g[b].PB(MP(a, D));
	}
	Main();
	cout << ans << endl;
	return 0;
}
#endif

/*

*/

Compilation message

race.cpp: In function 'void getNum(int)':
race.cpp:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < g[v].size(); i++)
                  ~~^~~~~~~~~~~~~
race.cpp: In function 'int centroid(int)':
race.cpp:63:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i<g[v].size(); i++)
                   ~^~~~~~~~~~~~
race.cpp: In function 'void dfs(int, long long int, int)':
race.cpp:97:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < g[v].size(); i++)
                  ~~^~~~~~~~~~~~~
race.cpp: In function 'void solve(int)':
race.cpp:111:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < g[v].size(); i++)
                  ~~^~~~~~~~~~~~~
race.cpp:120:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int j = 0; j < upd.size(); j++)
                   ~~^~~~~~~~~~~~
race.cpp:129:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < nxt.size(); i++)
                  ~~^~~~~~~~~~~~
race.cpp: In function 'int centroid(int)':
race.cpp:75:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 5120 KB Output is correct
2 Correct 7 ms 4992 KB Output is correct
3 Correct 7 ms 5120 KB Output is correct
4 Correct 7 ms 5120 KB Output is correct
5 Correct 6 ms 5120 KB Output is correct
6 Correct 8 ms 5116 KB Output is correct
7 Correct 8 ms 5220 KB Output is correct
8 Correct 7 ms 5120 KB Output is correct
9 Correct 6 ms 4992 KB Output is correct
10 Correct 7 ms 5120 KB Output is correct
11 Correct 6 ms 5120 KB Output is correct
12 Correct 6 ms 5120 KB Output is correct
13 Correct 8 ms 5120 KB Output is correct
14 Correct 6 ms 5120 KB Output is correct
15 Correct 7 ms 5100 KB Output is correct
16 Correct 7 ms 5120 KB Output is correct
17 Correct 7 ms 5120 KB Output is correct
18 Correct 8 ms 5120 KB Output is correct

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 5120 KB Output is correct
2 Correct 7 ms 4992 KB Output is correct
3 Correct 7 ms 5120 KB Output is correct
4 Correct 7 ms 5120 KB Output is correct
5 Correct 6 ms 5120 KB Output is correct
6 Correct 8 ms 5116 KB Output is correct
7 Correct 8 ms 5220 KB Output is correct
8 Correct 7 ms 5120 KB Output is correct
9 Correct 6 ms 4992 KB Output is correct
10 Correct 7 ms 5120 KB Output is correct
11 Correct 6 ms 5120 KB Output is correct
12 Correct 6 ms 5120 KB Output is correct
13 Correct 8 ms 5120 KB Output is correct
14 Correct 6 ms 5120 KB Output is correct
15 Correct 7 ms 5100 KB Output is correct
16 Correct 7 ms 5120 KB Output is correct
17 Correct 7 ms 5120 KB Output is correct
18 Correct 8 ms 5120 KB Output is correct
19 Correct 8 ms 5120 KB Output is correct
20 Correct 8 ms 5120 KB Output is correct
21 Correct 8 ms 5248 KB Output is correct
22 Runtime error 22 ms 15616 KB Execution killed with signal 11 (could be triggered by violating memory limits)
23 Halted 0 ms 0 KB -

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 5120 KB Output is correct
2 Correct 7 ms 4992 KB Output is correct
3 Correct 7 ms 5120 KB Output is correct
4 Correct 7 ms 5120 KB Output is correct
5 Correct 6 ms 5120 KB Output is correct
6 Correct 8 ms 5116 KB Output is correct
7 Correct 8 ms 5220 KB Output is correct
8 Correct 7 ms 5120 KB Output is correct
9 Correct 6 ms 4992 KB Output is correct
10 Correct 7 ms 5120 KB Output is correct
11 Correct 6 ms 5120 KB Output is correct
12 Correct 6 ms 5120 KB Output is correct
13 Correct 8 ms 5120 KB Output is correct
14 Correct 6 ms 5120 KB Output is correct
15 Correct 7 ms 5100 KB Output is correct
16 Correct 7 ms 5120 KB Output is correct
17 Correct 7 ms 5120 KB Output is correct
18 Correct 8 ms 5120 KB Output is correct
19 Correct 268 ms 13696 KB Output is correct
20 Correct 327 ms 13428 KB Output is correct
21 Correct 292 ms 14272 KB Output is correct
22 Correct 297 ms 14296 KB Output is correct
23 Correct 193 ms 13816 KB Output is correct
24 Correct 161 ms 13048 KB Output is correct
25 Correct 331 ms 15352 KB Output is correct
26 Correct 184 ms 19312 KB Output is correct
27 Correct 337 ms 22236 KB Output is correct
28 Correct 737 ms 30208 KB Output is correct
29 Correct 709 ms 29304 KB Output is correct
30 Correct 297 ms 22116 KB Output is correct
31 Correct 297 ms 22136 KB Output is correct
32 Correct 409 ms 22136 KB Output is correct
33 Correct 555 ms 20952 KB Output is correct
34 Correct 498 ms 24608 KB Output is correct

Subtask #4
0 / 57.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 5120 KB Output is correct
2 Correct 7 ms 4992 KB Output is correct
3 Correct 7 ms 5120 KB Output is correct
4 Correct 7 ms 5120 KB Output is correct
5 Correct 6 ms 5120 KB Output is correct
6 Correct 8 ms 5116 KB Output is correct
7 Correct 8 ms 5220 KB Output is correct
8 Correct 7 ms 5120 KB Output is correct
9 Correct 6 ms 4992 KB Output is correct
10 Correct 7 ms 5120 KB Output is correct
11 Correct 6 ms 5120 KB Output is correct
12 Correct 6 ms 5120 KB Output is correct
13 Correct 8 ms 5120 KB Output is correct
14 Correct 6 ms 5120 KB Output is correct
15 Correct 7 ms 5100 KB Output is correct
16 Correct 7 ms 5120 KB Output is correct
17 Correct 7 ms 5120 KB Output is correct
18 Correct 8 ms 5120 KB Output is correct
19 Correct 8 ms 5120 KB Output is correct
20 Correct 8 ms 5120 KB Output is correct
21 Correct 8 ms 5248 KB Output is correct
22 Runtime error 22 ms 15616 KB Execution killed with signal 11 (could be triggered by violating memory limits)
23 Halted 0 ms 0 KB -