Submission #137379

#	Time	Username	Problem	Language	Result	Execution time	Memory
137379		MAMBA	Toy Train (IOI17_train)	C++17	11 / 100	13 ms	1684 KiB

train

#include "train.h"
#include <bits/stdc++.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();

  vector<vi> adj(n), radj(n);

  rep(i, 0, m) {
    adj[u[i]].pb(v[i]);
    radj[v[i]].pb(u[i]);
  }

  vector<bool> dead(n);
  int L = 0, R = 0;
  vi q(n), cnt(n);
  rep(i, 0, n) if (r[i]) {
    dead[i] = true;
    q[R++] = i;
  }

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

  L = R = 0;

  fill(all(cnt), 0);
  rep(i, 0, n) for (auto e : adj[i]) if (!dead[e]) cnt[e]++;

  rep(i, 0, n) if (cnt[i] && (!a[i] || cnt[i] == adj[i].size())) {
    dead[i] = false;
    q[R++] = i;
  }

  while (L < R) {
    int me = q[L++];
    for (auto e : radj[me]) {
      if (!dead[e]) continue;
      cnt[e]++;
      if (!a[e] || cnt[e] == adj[e].size()) {
        q[R++] = e;
        dead[e] = false;
      }
    }
  }

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

Compilation message (stderr)

train.cpp: In function 'vi who_wins(vi, vi, vi, vi)':
train.cpp:36:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       if (a[e] || cnt[e] == adj[e].size()) {
train.cpp:48:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   rep(i, 0, n) if (cnt[i] && (!a[i] || cnt[i] == adj[i].size())) {
train.cpp:58:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       if (!a[e] || cnt[e] == adj[e].size()) {

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