Submission #1054943

#	Time	Username	Problem	Language	Result	Execution time	Memory
1054943		Wansur	Toy Train (IOI17_train)	C++17	12 / 100	5 ms	1628 KiB

train

#include <bits/stdc++.h>
#include "train.h"
#define ent '\n'
#define  f first
#define s second
//#define int long long

using namespace std;
typedef long long ll;
const int maxn = 5e3 + 12;
const int mod = 1e9 + 7;

vector<int> g[maxn], rg[maxn];
int in[maxn], out[maxn];
bool won[maxn];
int n, m;

vector<int> who_wins(vector<int> a, vector<int> r, vector<int> U, vector<int> V){
    n = a.size(), m = U.size();
    int v = -1;
    for(int i=0;i<n;i++){
        if(r[i]){
            assert(v == -1);
            v = i;
        }
    }
    assert(v != -1);
    won[v] = 1;
    for(int i=0;i<m;i++){
        g[U[i]].push_back(V[i]);
        rg[V[i]].push_back(U[i]);
        out[U[i]]++, in[V[i]]++;
    }
    queue<int> q;
    q.push(v);
    while(q.size()){
        int v = q.front();
        q.pop();
        for(int to:rg[v]){
            if(a[to] == 1 && !won[to]){
                won[to] = 1;
                q.push(to);
            }
            else if(a[to] == 0){
                out[to]--;
                if(!out[to]){
                    won[to] = 1;
                    q.push(to);
                }
            }
        }
    }

    bool ok = 1 - a[v];

    for(int to:g[v]){
        if(!a[v]) ok &= won[to];
        else ok |= won[to];
    }
    vector<int> ans(n);
    if(ok){
        for(int i=0;i<n;i++){
            ans[i] = won[i];
        }
    }
    return ans;
}

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