Submission #583949

#	Time	Username	Problem	Language	Result	Execution time	Memory
583949		PiejanVDC	Toy Train (IOI17_train)	C++17	0 / 100	8 ms	1780 KiB

train

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

using namespace std;

const int mxN = (int)5005;

vector<int>adj[mxN];
vector<int>radj[mxN];

vector<int>df;
vector<int>c(mxN);

int C = 0;

vector<bool>vis(mxN);
vector<bool>rvis(mxN);

void dfs(int u) {
    df.push_back(u);
    vis[u] = 1;
    for(auto z : adj[u]) if(!vis[z]) {
        dfs(z);
    }
}

int cnt;
vector<bool>have(mxN);

vector<int>R;

void col(int u) {
    cnt++;
    c[u] = C;
    rvis[u] = 1;
    if(R[u])
        have[C] = 1;
    for(auto z : radj[u]) if(!rvis[z]) {
        col(z);
    }
}

vector<int>who_wins(vector<int>a, vector<int>r, vector<int>u, vector<int>v) {

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

    R =r;

    vector<bool>self(n,0);

    for(int i = 0 ; i < m ; i++) {
        adj[u[i]].push_back(v[i]);
        radj[v[i]].push_back(u[i]);
        if(v[i] == u[i])
            self[v[i]] = 1;
    }

    dfs(0);

    vector<bool>valid(n,1);

    for(auto z : df) {
        if(c[z]) continue;

        C++;
        cnt = 0;
        col(z);

        if(cnt == 1)
            valid[z] = 0;
    }

    vector<int>ans(n,0);

    for(int i = 0 ; i < n ; i++) {
        vector<bool>t(n,0);
        t[i] = 1;
        stack<int>s;
        s.push(i);
        while(!s.empty()) {
            int node = s.top();
            s.pop();
            if((have[c[node]] && valid[node]) || (self[node] && r[node])) {
                ans[i] = 1;
                break;
            }
            for(auto z : adj[node]) if(!t[z]) {
                t[z] = 1;
                s.push(z);
            }
        }
    }

    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