Submission #1054257

#	Time	Username	Problem	Language	Result	Execution time	Memory
1054257		NeroZein	Cats or Dogs (JOI18_catdog)	C++17	0 / 100	0 ms	348 KiB

catdog

#include "bits/stdc++.h"
using namespace std;

#ifdef Nero
#include "Deb.h"
#else
#define debug(...)
#endif

const int N = 1003;

int n;
int a[N];
int pr[N];
int cats[N];
int dogs[N];
int dp[N][2];
vector<int> g[N]; 

void dfs(int v, int p) {
  for (int u : g[v]) {
    if (u != p) {
      pr[u] = v;
      dfs(u, v);
    }
  }
}

void initialize(int n_, vector<int> A, vector<int> B) {
  n = n_;
  for (int i = 0; i < n - 1; ++i) {
    g[A[i]].push_back(B[i]);
    g[B[i]].push_back(A[i]);
  }
  dfs(1, 1); 
}

int cat(int v) {
  a[v] = 1;
  cats[v]++; 
  bool f = false; 
  while (v != 1) {
    v = pr[v];
    if (!f) {
      dp[v][1]++;
    }
    f |= cats[v] > 0;
    cats[v]++; 
  }
  int ret = 0;
  for (int i = 1; i <= n; ++i) {
    if (a[v] == 0) {
      ret = max(ret, min(dp[i][0], dp[i][1]));      
    } else if (a[v] == 1) {
      ret = max(ret, dp[i][0]);
    } else {
      ret = max(ret, dp[i][1]); 
    }
  }
  return ret;
}

int dog(int v) {
  a[v] = 2;
  dogs[v]++;
  bool f = false;
  while (v != 1) {
    v = pr[v];
    if (!f) {
      dp[v][0]++;
    }
    f |= dogs[v] > 0;
    dogs[v]++; 
  }
  int ret = 0;
  for (int i = 1; i <= n; ++i) {
    if (a[v] == 0) {
      ret = max(ret, min(dp[i][0], dp[i][1]));      
    } else if (a[v] == 1) {
      ret = max(ret, dp[i][0]);
    } else {
      ret = max(ret, dp[i][1]); 
    }
  }
  return ret;
}

int neighbor(int v) {
  if (a[v] == 1) {
    cats[v]--; 
    bool f = false; 
    while (v != 1) {
      v = pr[v];
      if (!f) {
        dp[v][1]--;
      }
      f |= cats[v] > 0;
      cats[v]--; 
    }
  } else {
    dogs[v]--;
    bool f = false;
    while (v != 1) {
      v = pr[v];
      if (!f) {
        dp[v][0]--;
      }
      f |= dogs[v] > 0;
      dogs[v]--; 
    }
  }
  a[v] = 0;
  int ret = 0;
  for (int i = 1; i <= n; ++i) {
    if (a[v] == 0) {
      ret = max(ret, min(dp[i][0], dp[i][1]));      
    } else if (a[v] == 1) {
      ret = max(ret, dp[i][0]);
    } else {
      ret = max(ret, dp[i][1]); 
    }
  }
  return ret;
}

//int main() {
  //ios::sync_with_stdio(false);
  //cin.tie(nullptr);
  //int n;
  //cin >> n;
  //vector<int> A(n), B(n);
  //for (int i = 0; i < n - 1; ++i) {
    //cin >> A[i] >> B[i];
  //}
  //initialize(n, A, B);
  //int q;
  //cin >> q;
  //while(q--) {
    //int type, v;
    //cin >> type >> v;
    //int ans = 0;
    //if (type == 1) {
      //ans = cat(v);
    //} else if (type == 2) {
      //ans = dog(v);
    //} else {
      //ans = neighbor(v);
    //}
    //cout << ans << '\n';
  //}
  //return 0;
//}

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