제출 #960378

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
960378		Prieved1	봉쇄 시간 (IOI23_closing)	C++17	8 / 100	95 ms	34088 KiB

closing

#include "closing.h"
#include <bits/stdc++.h>
using namespace std;
const int MAXN=200010;
vector<pair<int,int>> g[MAXN];
long long distX[MAXN], distY[MAXN];
void dfsx(int at, int p) {
  for(auto [to,w]:g[at]) {
    if(to==p)continue;
    distX[to]=distX[at]+w;
    dfsx(to, at);
  }
}
void dfsy(int at, int p) {
  for(auto [to,w]:g[at]) {
    if(to==p)continue;
    distY[to]=distY[at]+w;
    dfsy(to, at);
  }
}
int max_score(int N, int X, int Y, long long K,
              std::vector<int> U, std::vector<int> V, std::vector<int> W)
{
  for(int i = 0;i<N-1;i++) {
    g[U[i]].push_back({V[i], W[i]});
    g[V[i]].push_back({U[i], W[i]});
  }
  dfsx(X, -1);
  dfsy(Y, -1);
  int ans=0;
  // case 1
  {
    int cnt=0;
    priority_queue<long long> pq;
    for(int i = 0;i<N;i++) {
      pq.push(-distX[i]);
      pq.push(-distY[i]);
    }
    long long sum=0;
    while(sum<=K) {
      sum-=pq.top();
      cnt++;
      pq.pop();
      if(sum<=K)ans=max(ans,cnt);
    }
  }
  for(int i = 0;i<=N;i++) {
    distX[i]=distY[i]=0;
    g[i].clear();
  }
  return ans;
}

• Subtask 0: 0 / 0
• Subtask 1: 8 / 8
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