Submission #838522

#	Time	Username	Problem	Language	Result	Execution time	Memory
838522		thimote75	Toy Train (IOI17_train)	C++14	16 / 100	1312 ms	1692 KiB

train

#include "train.h"
#include <bits/stdc++.h>

using namespace std;

using idata = vector<int>;
using bdata = vector<bool>;
using igrid = vector<idata>;

idata controller, charger;
int N, M;

igrid roads;

idata visited; int stage = 1;
bdata status;

bool dfs (int msk) {
	int node = msk >> 1;
	int type = msk & 1;

	if (visited[msk] >= stage) return status[msk];
	visited[msk] = stage;

	if (type == 1 && visited[msk - 1] == stage) {
		status[msk] = true;
		visited[msk] = stage + 1;
		return true;
	}

	status[msk] = false;

	bool rstatus = controller[node] == 0;
	for (int next : roads[node]) {
		int nxt_msk = next * 2 + type;

		bool result = dfs(nxt_msk);

		if (charger[node] == 1 && !result && type == 0)
			result |= node == next || dfs(nxt_msk + 1);
		
		if (controller[node] == 1 && result) {
			rstatus = true;
			break ;
		}
		if (controller[node] == 0 && !result) {
			rstatus = false;
			break ;
		}
	}

	status[msk] = rstatus;
	visited[msk] = stage + 1;
	return status[msk];
}

idata who_wins(idata _controller, idata _charger, idata u, idata v) {
	N = _controller.size(); M = u.size();

	controller = _controller;
	charger    = _charger;

	roads.resize(N);

	for (int i = 0; i < M; i ++)
		roads[u[i]].push_back(v[i]);

	visited.resize(2 * N);
	status .resize(2 * N);

	idata answer(N, false);
	for (int i = 0; i < N; i ++) {
		answer[i] = dfs(2 * i);
		stage += 2;
	}

	return answer;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 11 / 11
• Subtask 4: 0 / 11
• Subtask 5: 0 / 12
• Subtask 6: 0 / 51