Submission #797698

#	Time	Username	Problem	Language	Result	Execution time	Memory
797698		PixelCat	Toy Train (IOI17_train)	C++14	0 / 100	7 ms	1620 KiB

train

#ifdef NYAOWO
#include "grader.cpp"
#endif

#include "train.h"

#include <bits/stdc++.h>
#define For(i, a, b) for(int i = a; i <= b; i++)
#define Forr(i, a, b) for(int i = a; i >= b; i--)
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define sz(x) ((int)x.size())
#define eb emplace_back
#define int LL
using namespace std;
using i32 = int32_t;
using LL = long long;
using pii = pair<int, int>;

const int MAXN = 5000;

vector<int> adj[MAXN + 10];
vector<int> rev[MAXN + 10];
int tag[MAXN + 10];

void walk(int s, vector<int> ad[], int tg) {
    queue<int> que;
    que.emplace(s);
    tag[s] |= tg;
    while(!que.empty()) {
        int cur = que.front(); que.pop();
        for(auto &i:ad[cur]) if((tag[i] & tg) == 0) {
            tag[i] |= tg;
            que.emplace(i);
        }
    }
}

vector<i32> who_wins(vector<i32> a, vector<i32> r, vector<i32> u, vector<i32> v) {
    int n = sz(a);
    int m = sz(u);

    For(i, 0, m - 1) {
        adj[u[i]].eb(v[i]);
        rev[v[i]].eb(u[i]);
    }
    memset(tag, 0, sizeof(tag));

    int s = -1;
    For(i, 0, n - 1) if(r[i]) s = i;
    walk(s, adj, 1);
    walk(s, rev, 2);

    vector<i32> mangocube(n);
    For(i, 0, n - 1) mangocube[i] = (tag[i] == 3);
    return mangocube;  // mango & cube win
}

/*

2 4
0 1
1 0
0 0
0 1
1 0
1 1

1 1

*/

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