Submission #583921

#	Time	Username	Problem	Language	Result	Execution time	Memory
583921		PiejanVDC	Toy Train (IOI17_train)	C++17	0 / 100	164 ms	262144 KiB

train

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

using namespace std;

vector<int>tim;
vector<int>s,a,r;
vector<int>adj[200];
vector<int>ans;

int t = 1;

bool dfs(int u) {
    if(ans[u])
        return 1;
    if(tim[u] && !s.empty()) {
        if(s.back() >= tim[u])
            return 1;
        return 0;
    }

    tim[u] = t++;
    if(r[u])
        s.push_back(t-1);

    bool ok;
    if(a[u]) {
        ok = 0;
        for(auto z : adj[u]) {
            ok |= dfs(z);
        }
    } else {
        ok = 1;
        for(auto z : adj[u]) {
            ok &= dfs(z);
        }
    }

    if(r[u])
        s.pop_back();
    tim[u] = 0;

    return ok;
}

vector<int>who_wins(vector<int>A, vector<int>R, vector<int>u, vector<int>v) {

    r = R;
    a = A;

    int n = r.size();
    int m = u.size();

    for(int i = 0 ; i < m ; i++) {
        adj[u[i]].push_back(v[i]);
    }

    ans.resize(n,0);

    for(int i = 0 ; i < n ; i++) {
        t = 1;
        tim.clear();
        tim.resize(n,0);
        ans[i] = dfs(i);
    }

    return ans;
}

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