Submission #137852

#	Time	Username	Problem	Language	Result	Execution time	Memory
137852		MAMBA	Toy Train (IOI17_train)	C++17	0 / 100	12 ms	2424 KiB

train

#include "train.h"

using namespace std;

#define rep(i, j, k) for (int i = j; i < (int)k; i++)
#define pb push_back
#define all(x) x.begin(), x.end()

typedef vector<int> vi;

vi who_wins(vi a, vi r, vi u, vi v) {
  int n = a.size();
  int m = u.size();
  int L, R;

  vector<vi> adj(n);
  vi d(n), cnt(n);
  rep(i, 0, m) {
    adj[v[i]].pb(u[i]);
    d[u[i]]++;
  }

  vector<bool> dead(n);
  vi q(n);

  while (true) {
    fill(all(dead), true);
    fill(all(cnt), 0);
    L = R = 0;
    rep(i, 0, n) if (r[i]) {
      dead[i] = false;
      q[R++] = i;
    }
    while (L < R) {
      int me = q[L++];
      for (auto e : adj[me]) {
        cnt[e]++;
        if (a[e] || cnt[e] == d[e]) {
          dead[e] = false;
          q[R++] = e;
        }
      }
    }

    L = R = 0;
    fill(all(cnt), 0);
    rep(i, 0, m) if (dead[v[i]]) cnt[u[i]]++;
    rep(i, 0, n) if (cnt[i] && (!a[i] || cnt[i] == d[i])) {
      dead[i] = true;
      q[R++] = i;
    }

    while (L < R) {
      int me = q[L++];
      for (auto e : adj[me]) {
        cnt[e]++;
        if (!a[e] || cnt[e] == d[e]) {
          dead[e] = true;
          q[R++] = e;
        }
      }
    }

    bool flag = false;
    rep(i, 0, n) if (dead[i] && r[i]) {
      flag = true;
      r[i] = 0;
    }
    if (!flag) break;
  }

  fill(all(dead), true);
  fill(all(cnt), 0);
  L = R = 0;
  rep(i, 0, n) if (r[i]) {
    dead[i] = false;
    q[R++] = i;
  }
  while (L < R) {
    int me = q[L++];
    for (auto e : adj[me]) {
      cnt[e]++;
      if (a[e] || cnt[e] == d[e]) {
        dead[e] = false;
        q[R++] = e;
      }
    }
  }

  vi res(n);
  rep(i, 0, n) if (!dead[i]) res[i] = 1;
  return res;
}

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