Submission #106181

#	Time	Username	Problem	Language	Result	Execution time	Memory
106181		tictaccat	Werewolf (IOI18_werewolf)	C++14	15 / 100	4019 ms	32180 KiB

werewolf

#include "werewolf.h"
#include <bits/stdc++.h>

using namespace std;

const int INF = 1e8;

void dfsHuman(int u, int N, vector<vector<int>> &adj, vector<bool> &humanReach, int curL) {
    if (humanReach[u] || u < curL) return;
    humanReach[u] = true;
    for (int v: adj[u]) {
        dfsHuman(v,N,adj,humanReach,curL);
    }
}

void dfsWolf(int u, int N, vector<vector<int>> &adj, vector<bool> &wolfReach, int curR) {
    if (wolfReach[u] || u > curR) return;
    wolfReach[u] = true;
    for (int v: adj[u]) {
        dfsWolf(v,N,adj,wolfReach,curR);
    }
}

std::vector<int> check_validity(int N, std::vector<int> X, std::vector<int> Y,std::vector<int> S, std::vector<int> E, std::vector<int> L, std::vector<int> R) {

    int Q = S.size();

    vector<vector<int>> adj(N);
  
    for (int i = 0; i < X.size(); i++) {
        adj[X[i]].push_back(Y[i]);
        adj[Y[i]].push_back(X[i]);
    }

    vector<int> A(Q,0);


    for (int q = 0; q < Q; q++) {
        //S[q],E[q],L[q],R[q]
        vector<bool> humanReach(N,false), wolfReach(N,false);
        dfsHuman(S[q],N,adj,humanReach,L[q]);
        dfsWolf(E[q],N,adj,wolfReach,R[q]);
        bool connected = false;
        for (int i = 0; i < N; i++) {
            if (humanReach[i] && wolfReach[i]) {
                connected = true;
             //   cerr << i << "\n";
            }
        }
        A[q] = connected;
    }

  return A;
}

Compilation message (stderr)

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:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < X.size(); i++) {
                     ~~^~~~~~~~~~

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