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Submission #497812

# Submission time Handle Problem Language Result Execution time Memory
497812 2021-12-23T21:34:17 Z MilosMilutinovic Stations (IOI20_stations) C++14
0 / 100
 3000 ms 2097156 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 1005;
const int L = 10;

int par[N][L], dep[N];
std::vector<int> G[N];

void dfs_init(int u, int p) {
	par[u][0] = p;
	for (int i = 1; i < L; ++i)
		if (par[u][i - 1] != -1)
			par[u][i] = par[par[u][i - 1]][i - 1];
	for (int v : G[u])
		if (v != p)
			dep[v] = dep[u] + 1, dfs_init(v, u);
}

int lca(int u, int v) {
	if (dep[u] < dep[v]) swap(u, v);
	for (int i = L - 1; ~i; --i)
		if (par[u][i] != -1 && dep[par[u][i]] >= dep[v])
			u = par[u][i];
	if (u == v) return u;
	for (int i = L - 1; ~i; --i)
		if (par[u][i] != par[v][i])
			u = par[u][i], v = par[v][i];
	return (u == v ? u : par[u][0]);
}

int n;

std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	::n = n;
	for (int i = 0; i < n - 1; ++i) {
		G[u[i]].push_back(v[i]);
		G[v[i]].push_back(u[i]);
	}

	dfs_init(0, -1);

	std::vector<int> l(n);
	iota(l.begin(), l.end(), 0);
	return l;
}

int find_next_station(int s, int t, std::vector<int> c) {
	//assert(s < n && t < n);
	std::vector<int> path;
	int l = lca(s, t);
	while (s != -1 && dep[s] >= dep[l]) {
		path.push_back(s);
		s = par[s][0];
	}
	while (t != -1 && dep[t] >= dep[l]) {
		path.push_back(t);
		t = par[t][0];
	}
	int node = 0;
	for (int i : path) for (int j : c)
		if (i == j) node = j;
	return node;
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 2341 ms 2097156 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3050 ms 432 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Runtime error 1879 ms 2097156 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 2629 ms 2097156 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #5
0 / 61.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3172 ms 1732652 KB Time limit exceeded
2 Halted 0 ms 0 KB -