Submission #673712

#	Time	Username	Problem	Language	Result	Execution time	Memory
673712		vjudge1	Stations (IOI20_stations)	C++17	10 / 100	904 ms	620 KiB

stations

#include <vector>
//#include "IOI20_Stations.h"
const int N = 1000;
int cnt=0;

std::vector<int> labels;

/*
clarifications:
k == n-1
c is sorted
*/

std::vector<std::vector<int>> g;
void dfs(int node, int par) {
	labels[node] = cnt++;
	for (int ch : g[node]) {
		if (ch != par) {
			dfs(ch, node);
		}
	}
	labels[node] += N * (cnt++);
}

std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	/*
	1. Construct adjacency list
	2. Label every node with its mrg(dt,ft)
	*/
	g.clear();
	g.resize(n);
	for (int i = 0; i < n - 1;i++) {
		g[u[i]].push_back(v[i]);
		g[v[i]].push_back(u[i]);
	}
	cnt = 0;
	labels.clear();
	labels.resize(n);
	dfs(0, -1);
	return labels;
}

int find_next_station(int s, int t, std::vector<int> c) {
	int sz = c.size();
	for (int i = 0; i < sz-1; i++) {
		// The destination is under this child, Because it's impossible that it was discovered after that, or before that
		if (t%N >= c[i]%N && t%N < c[i]/N)
			return c[i];
	}
	return c[sz - 1];
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 10 / 10
• Subtask 5: 0 / 61