Submission #1016337

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016337		lacito	Werewolf (IOI18_werewolf)	C++14	7 / 100	4062 ms	27988 KiB

werewolf

#include "werewolf.h"
using namespace std;

const int MAXN = 3000;

vector<int> g[MAXN];
vector<bool> vis;
int n, l, r;

void dfs(int v, bool human) {
  vis[v] = true;
  for (int u : g[v]) {
    if (!vis[u]) {
      if (human && u >= l || !human && u <= r) { // werewolf condition
        dfs(u, human);
      }
    }
  }
}


int solve(int s, int e) {
  // check all the cities where we can transform
  for (int i = l; i <= r; i++) {
    vis.assign(n, false);
    dfs(i, true);
    if (vis[s]) {
      vis.assign(n, false);
      dfs(i, false);
      if (vis[e]) return 1;
    }
  }
  return 0;
}

vector<int> check_validity(int N, vector<int> X, vector<int> Y,
                                  vector<int> S, vector<int> E,
                                  vector<int> L, vector<int> R) {
  for (int i = 0; i < X.size(); i++) {
    // road between X[i] and Y[i]
    g[X[i]].push_back(Y[i]);
    g[Y[i]].push_back(X[i]);
  }
  n = N;
  int Q = S.size();
  vector<int> A(Q);
  for (int i = 0; i < Q; ++i) {
    l = L[i];
    r = R[i];
    A[i] = solve(S[i], E[i]);
  }
  return A;
}

Compilation message (stderr)

werewolf.cpp: In function 'void dfs(int, bool)':
werewolf.cpp:14:17: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   14 |       if (human && u >= l || !human && u <= r) { // werewolf condition
      |           ~~~~~~^~~~~~~~~
werewolf.cpp: In function 'std::vector<int> check_validity(int, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
werewolf.cpp:39:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |   for (int i = 0; i < X.size(); i++) {
      |                   ~~^~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 8
• Subtask 3: 0 / 34
• Subtask 4: 0 / 51