Submission #398477

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
398477	2021-05-04 11:10:13	model_code	The Xana coup (BOI21_xanadu)	C++17	100 / 100	143 ms	36744 KiB

xanadu

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#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1000000;
int N, L[MAXN], dp[MAXN][2][2];
vector<int> e[MAXN];
void dfs(int i = 0, int p = -1) {
  for (int s = 0; s < 2; s++) {
    dp[i][s][L[i] ^ s] = s;
    dp[i][s][L[i] ^ s ^ 1] = N + 1;
  }
  for (int j : e[i])
    if (j != p) {
      dfs(j, i);
      for (int s = 0; s < 2; s++) {
        int dp0 = dp[i][s][0], dp1 = dp[i][s][1];
        dp[i][s][0] = min(N + 1, min(dp0 + dp[j][0][s], dp1 + dp[j][1][s]));
        dp[i][s][1] = min(N + 1, min(dp0 + dp[j][1][s], dp1 + dp[j][0][s]));
      }
    }
}
int main() {
  cin >> N;
  int A, B;
  for (int i = 0; i < N - 1; i++) {
    cin >> A >> B;
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 40 / 40
• Subtask 5: 30 / 30