Submission #532249

#	Time	Username	Problem	Language	Result	Execution time	Memory
532249		Alex_tz307	Cats or Dogs (JOI18_catdog)	C++17	38 / 100	3066 ms	5980 KiB

catdog

#include <bits/stdc++.h>
#include "catdog.h"
#define INF 0x3f3f3f3f

using namespace std;

const int kN = 1e5;
vector<int> g[1 + kN];
short col[1 + kN];
int dp[1 + kN][2];

void minSelf(int &x, int y) {
  if (y < x) {
    x = y;
  }
}

void dfs(int u, int par) {
  dp[u][0] = dp[u][1] = 0;
  for (int v : g[u]) {
    if (v != par) {
      dfs(v, u);
      for (int i = 0; i < 2; ++i) {
        dp[u][i] += min(dp[v][i], dp[v][i ^ 1] + 1);
      }
    }
  }
  if (col[u] < 2) {
    dp[u][col[u] ^ 1] = INF;
  }
}

void initialize(int N, vector<int> A, vector<int> B) {
  for (int i = 0; i < N - 1; ++i) {
    g[A[i]].emplace_back(B[i]);
    g[B[i]].emplace_back(A[i]);
  }
  for (int v = 1; v <= N; ++v) {
    col[v] = 2;
  }
}

int cat(int v) {
  col[v] = 0;
  dfs(1, 0);
  return min(dp[1][0], dp[1][1]);
}

int dog(int v) {
  col[v] = 1;
  dfs(1, 0);
  return min(dp[1][0], dp[1][1]);
}

int neighbor(int v) {
  col[v] = 2;
  dfs(1, 0);
  return min(dp[1][0], dp[1][1]);
}

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