Submission #1070510

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1070510	2024-08-22 14:52:38	duckindog	The Xana coup (BOI21_xanadu)	C++17	100 / 100	40 ms	17012 KiB

xanadu

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#include <bits/stdc++.h>
using namespace std;
const int N = 100'000 + 10;
int n;
vector<int> ad[N];
int a[N];
long long f[N][2][2], dp[2][2];
void dfs(int u, int p = -1) { 
  f[u][0][0] = f[u][0][1] = f[u][1][0] = f[u][1][1] = N;
  f[u][a[u]][0] = 0;
  f[u][a[u] ^ 1][1] = 1;
  for (const auto& v : ad[u]) { 
    if (v == p) continue;
    dfs(v, u);
    for (int i = 0; i < 2; ++i) { 
      for (int j = 0; j < 2; ++j) dp[i][j] = f[u][i][j];
    }
    for (int a = 0; a < 2; ++a) { 
      for (int b = 0; b < 2; ++b) { 
        auto& ret = f[u][a][b];
        ret = min(dp[a][b] + f[v][b][0], dp[a ^ 1][b] + f[v][b][1]);
      }
    }
  }
}
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 40 / 40
• Subtask 5: 30 / 30