Submission #1016346

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016346		lacito	Werewolf (IOI18_werewolf)	C++14	15 / 100	164 ms	19544 KiB

werewolf

#include "werewolf.h"
using namespace std;
 
const int MAXN = 3000;
 
vector<int> g[MAXN];
vector<bool> vis1;
vector<bool> vis2;
int n, l, r;
 
void dfs(int v, bool human, vector<bool> &vis) {
  vis[v] = true;
  for (int u : g[v]) {
    if (!vis[u]) {
      if (human && u >= l || !human && u <= r) { // werewolf condition
        dfs(u, human, vis);
      }
    }
  }
}
 
 
int solve(int s, int e) {
      // check all the cities where we can transform
    vis1.assign(n, false);
    dfs(s, true, vis1);
    vis2.assign(n, false);
    dfs(e, false, vis2);
    for(int i = 0; i < vis1.size(); i++){
        if(vis1[i] && vis2[i]){
            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, std::vector<bool>&)':
werewolf.cpp:15:17: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   15 |       if (human && u >= l || !human && u <= r) { // werewolf condition
      |           ~~~~~~^~~~~~~~~
werewolf.cpp: In function 'int solve(int, int)':
werewolf.cpp:29:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for(int i = 0; i < vis1.size(); i++){
      |                    ~~^~~~~~~~~~~~~
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:41:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |   for (int i = 0; i < X.size(); i++) {
      |                   ~~^~~~~~~~~~

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