제출 #1151445

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1151445		burgerguy	9월 (APIO24_september)	C++20	0 / 100	1 ms	580 KiB

september

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int solve(int N, int M, std::vector<int> F, std::vector<std::vector<int>> S) {
   vector<set<ll>> initialTree(N);
   for (int i = 1; i < F.size(); i++) {
      initialTree[F[i]].insert(i);
   }

   set<ll> initialLeaves;
   for (int i = 0; i < initialTree.size(); ++i) {
      if(initialTree[i].empty()) initialLeaves.insert(i);
   }

   ll maxDays = 0;
   for(vector<int> record : S) {
      ll curDays = 0;
      vector<set<ll>> tree = initialTree;
      set<ll> leaves = initialLeaves;

      for(int e : record) {
         if(leaves.find(e) != leaves.end()) {
            leaves.erase(e);
            tree[F[e]].erase(e);

            if(tree[F[e]].empty()) {
               leaves.insert(F[e]);
            }

            ++curDays;
         }
         else break;
      }

      maxDays = max(maxDays, curDays);
   }

   return maxDays;
}

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