oj.uz

Submission #882009

# Submission time Handle Problem Language Result Execution time Memory
882009 2023-12-02T12:02:16 Z serifefedartar Dreaming (IOI13_dreaming) C++17
18 / 100
 35 ms 13916 KB 
#include <bits/stdc++.h>
#include "dreaming.h"
using namespace std;

#define fast ios::sync_with_stdio(0);cin.tie(0);
#define s second
#define f first
typedef long long ll;
const ll MOD = 998244353;
const ll LOGN = 21;
const ll MAXN = 1e5 + 10000;

vector<vector<pair<int,int>>> graph;
int vis[MAXN], up[MAXN], mx[MAXN];
pair<int,int> st[MAXN];
int dfs(int node, int parent) {
	for (auto u : graph[node]) {
		if (u.f == parent)
			continue;
		int Q = u.s + dfs(u.f, node);
		if (Q > st[node].f)
			st[node] = {Q, st[node].f};
		else if (Q > st[node].s)
			st[node] = {st[node].f, Q};
	}
	return st[node].f;
}

void dfs2(int node, int parent, int par_len) {
	vis[node] = true;
	if (node != parent) {
		int th = st[node].f + par_len;
		up[node] = up[parent] + par_len;
		if (th == st[parent].f)
			up[node] = max(up[node], st[parent].s + par_len);
		else
			up[node] = max(up[node], st[parent].f + par_len);
	}
	mx[node] = max(up[node], st[node].f);

	for (auto u : graph[node]) {
		if (u.f == parent)
			continue;
		dfs2(u.f, node, u.s);
	}
}

int mx_node = 0, mx_dist = -1;
void dfs3(int node, int parent, int dist) {
	if (dist > mx_dist) {
		mx_dist = dist;
		mx_node = node;
	}

	for (auto u : graph[node]) {
		if (u.f == parent)
			continue;
		dfs3(u.f, node, dist + u.s);
	}
}

int diameter(int node) {
	mx_dist = -1, mx_node = 0;
	dfs3(node, node, 0);
	int q = mx_node;
	mx_dist = -1, mx_node = 0;
	dfs3(q, q, 0);
	return mx_dist;
}

int nd = 0;
void dfs4(int node, int parent) {
	vis[node] = true;
	if (mx[node] > nd)
		nd = mx[node];
	for (auto u : graph[node]) {
		if (u.f == parent)
			continue;
		dfs4(u.f, node);
	}
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
	graph = vector<vector<pair<int,int>>>(N+1, vector<pair<int,int>>());
	for (int i = 0; i < M; i++) {
		graph[A[i]].push_back({B[i], T[i]});
		graph[B[i]].push_back({A[i], T[i]});
	}

	for (int i = 1; i <= N; i++) {
		if (!vis[i]) {
			dfs(i, i);
			dfs2(i, i, 0);
		}
	}

	for (int i = 1; i <= N; i++)
		vis[i] = false;
	priority_queue<pair<int,int>> pq;
	for (int i = 1; i <= N; i++) {
		if (!vis[i]) {
			int dia = diameter(i);
			nd = 0;
			dfs4(i, i);
			pq.push({nd, dia});
		}
	}

	while (pq.size() >= 2) {
		pair<int,int> A = pq.top();
		pq.pop();
		pair<int,int> B = pq.top();
		pq.pop();
		
		int new_dia = max(A.s, max(B.s, A.f + B.f + L));
		int new_mx = min(max(A.f, B.f + L), max(A.f + L, B.f));
		pq.push({new_mx, new_dia});
	}

	return pq.top().s;
}

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 35 ms 13916 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 35 ms 13916 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 31 ms 8272 KB Output is correct
2 Correct 29 ms 8412 KB Output is correct
3 Correct 22 ms 8160 KB Output is correct
4 Correct 22 ms 8356 KB Output is correct
5 Correct 22 ms 8156 KB Output is correct
6 Correct 24 ms 9180 KB Output is correct
7 Correct 23 ms 8412 KB Output is correct
8 Correct 21 ms 8160 KB Output is correct
9 Correct 21 ms 8152 KB Output is correct
10 Correct 26 ms 8404 KB Output is correct
11 Correct 0 ms 2392 KB Output is correct
12 Correct 12 ms 6868 KB Output is correct
13 Correct 13 ms 6864 KB Output is correct
14 Correct 13 ms 6864 KB Output is correct
15 Correct 13 ms 6868 KB Output is correct
16 Correct 13 ms 6868 KB Output is correct
17 Correct 12 ms 6612 KB Output is correct
18 Correct 13 ms 6840 KB Output is correct
19 Correct 16 ms 6868 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 2652 KB Output is correct
23 Correct 13 ms 6868 KB Output is correct

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 35 ms 13916 KB Output isn't correct
2 Halted 0 ms 0 KB -