Submission #255560

#	Time	Username	Problem	Language	Result	Execution time	Memory
255560		Hehehe	Toy Train (IOI17_train)	C++14	100 / 100	424 ms	1536 KiB

train

#include "train.h"
#include<bits/stdc++.h> //:3
using namespace std;
typedef long long ll;
#define all(a) (a).begin(), (a).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define pi pair<long double, long double>
#define sz(x) (int)((x).size())

const int N = 5e3 + 11;
int n, m;
int ok[N], DEG[N], deg[N], a[N], r[N], viz[N], station[N], prv[N], flag;
vector<int>adj[N];

void bfs(){

    for(int i = 0; i < n; i++){
        viz[i] = 0;
        prv[i] = ok[i];
        station[i] = 0;
        deg[i] = DEG[i];
    }

    queue<int>q;

    for(int i = 0; i < n; i++){
        if(!ok[i] || !r[i])continue;
            
        for(auto it : adj[i]){
            if(viz[it])continue;
            
            if(a[it] || !(--deg[it])){
                viz[it] = 1;
                q.push(it);
            }
        }
        
        station[i] = 1;
    }

    for(int i = 0; i < n; i++)ok[i] = 0;

    while(!q.empty()){

        int i = q.front();
        q.pop();

        ok[i] = 1;
        if(station[i])continue;

        for(auto it : adj[i]){
            if(viz[it])continue;

            if(a[it] || !(--deg[it])){
                viz[it] = 1;
                q.push(it);
            }
        }
    }

    int fl = 0;
    for(int i = 0; i < n; i++){
        if(ok[i] != prv[i])fl = 1;
    }

    if(!fl)flag = 1;
}

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

    n = sz(A);
    m = sz(u);

    for(int i = 0; i < n; i++){
        r[i] = R[i];
        a[i] = A[i];
    }

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

    for(int i = 0; i < n; i++){
        for(auto it : adj[i]){
            DEG[it]++;
        }
    }

    memset(ok, 1, sizeof(ok));

    for(int i = 0; i < n && !flag; i++){
        bfs();
    }

    vector<int> res;
    for(int i = 0;i < n; i++){
        res.push_back(ok[i]);
    }

    return res;
}

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