Submission #669797

#	Time	Username	Problem	Language	Result	Execution time	Memory
669797		someone	Toy Train (IOI17_train)	C++14	100 / 100	267 ms	1532 KiB

train

//#include "train.h"
#include <bits/stdc++.h>
using namespace std;
 
const int N = 1e4 + 42, INF = 1e9;

int n, m, nb[N], nbS[N];
vector<int> adj[N], ans;
bool isA[N], isR[N], sent[N], mod[N];

void dfs(int i) {
    if(sent[i])
        return;
    sent[i] = true;
    for(int j : adj[i]) {
        nbS[j]++;
        if(isA[j] || nbS[j] == nb[j])
            dfs(j);
    }
}
 
vector<int> who_wins(vector<int> a, vector<int> r, vector<int> u, vector<int> v) {
    n = (int)a.size();
    m = (int)u.size();
    for(int i = 0; i < n; i++)
        isA[i] = (a[i] == 1),
        isR[i] = (r[i] == 1);
    for(int i = 0; i < m; i++) {
        nb[u[i]]++;
        adj[v[i]].push_back(u[i]);
    }
    
    deque<int> id;
    for(int i = 0; i < n; i++)
        if(r[i])
            id.push_back(i);
    int sz = (int)id.size();
    while(true) {
        for(int i : id)
            dfs(i);
        for(int i = 0; i < sz; i++) {
            if((isA[id[0]] && nbS[id[0]] > 0) || nbS[id[0]] == nb[id[0]])
                id.push_back(id[0]);
            id.pop_front();
        }
        for(int i = 0; i < n; i++) {
            nbS[i] = 0;
            sent[i] = false;
        }
        if(sz == (int)id.size())
            break;
        sz = id.size();
    }
    for(int i : id)
        dfs(i);
    for(int i = 0; i < n; i++)
        ans.push_back(sent[i]);
    return ans;
}

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