Submission #457955

#	Time	Username	Problem	Language	Result	Execution time	Memory
457955		rainboy	Stations (IOI20_stations)	C++17	52.32 / 100	1329 ms	55636 KiB

stations

#include "stations.h"
#include <vector>

using namespace std;
typedef vector<int> vi;

const int N = 1000;

void dfs(vector<vi> ej, vi &ta, vi &tb, int p, int i, int &time) {
	ta[i] = time++;
	for (int j : ej[i])
		if (j != p)
			dfs(ej, ta, tb, i, j, time);
	tb[i] = time - 1;
}

vi label(int n, int k, vi uu, vi vv) {
	vector<vi> ej(n);
	vi ta(n, 0), tb(n, 0), labels(n, 0);
	int h, i, time;

	for (h = 0; h < n - 1; h++) {
		ej[uu[h]].push_back(vv[h]);
		ej[vv[h]].push_back(uu[h]);
	}
	time = 0, dfs(ej, ta, tb, -1, 0, time);
	for (i = 0; i < n; i++)
		labels[i] = ta[i] * N + tb[i];
	return labels;
}

int find_next_station(int s, int t, vi cc) {
	int m = cc.size(), h;

	for (h = 0; h < m; h++)
		if (cc[h] / N > s / N && cc[h] / N <= t / N && t / N <= cc[h] % N)
			return cc[h];
	for (h = 0; h < m; h++)
		if (cc[h] / N < s / N)
			return cc[h];
	return -1;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 26.3205 / 61