Submission #213563

#	Time	Username	Problem	Language	Result	Execution time	Memory
213563		erd1	Cats or Dogs (JOI18_catdog)	C++14	0 / 100	5 ms	384 KiB

catdog

#include "catdog.h"
#include<bits/stdc++.h>
using namespace std;
#define all(x) (x).begin(), (x).end()
#define ff first
#define ss second
#define pb push_back
typedef pair<int, int> pii;
vector<int> o;
vector<vector<int>> G;
void initialize(int N, std::vector<int> A, std::vector<int> B) {
  G.resize(N+1);
  o.resize(N+1);
  for(int i = 0; i < N-1; i++){
    G[A[i]].pb(B[i]);
    G[B[i]].pb(A[i]);
  }
}

pii dfs(int i, int par){
//cout << i << " " << par << endl;
    pii ans = {o[i]&1, o[i]>>1};
    for(auto x: G[i]){
        if(x == par)continue;
        auto a = dfs(x, i);
        ans.ss += min(a.ss, a.ff+1);
        ans.ff += min(a.ff, a.ss+1);
    }
    return ans;
}

int min(pii x){
    return min(x.ff, x.ss);
}

int cat(int v) {
  o[v] = 1;
  return min(dfs(1, 1));
}

int dog(int v) {
  o[v] = 2;
  return min(dfs(1, 1));
}

int neighbor(int v) {
  o[v] = 0;
  return min(dfs(1, 1));
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 30
• Subtask 3: 0 / 62