Submission #894256

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
894256	2023-12-28 03:08:15	box	The Xana coup (BOI21_xanadu)	C++17	100 / 100	69 ms	20092 KiB

xanadu

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#include <bits/stdc++.h>
using namespace std;
 
#define ar array
#define sz(v) static_cast<int>(v.size())
#define all(v) (v).begin(), (v).end()
typedef pair<int, int> pi;
typedef long long ll;
typedef vector<int> vi;
 
const int N = 1e5, INF = 1e9;
 
int n, a[N];
ar<int, 2> dp[N][2];
vi g[N];
 
ar<int, 2> operator+(const ar<int, 2> &u, const ar<int, 2> &v) {
  return {min({INF, u[0] + v[0], u[1] + v[1]}),
          min({INF, u[0] + v[1], u[1] + v[0]})};
}
 
void dfs(int p, int i) {
  ar<int, 2> op0{0, INF}, op1{INF, 1};
  for (int j : g[i])
    if (p ^ j) {
      dfs(i, j);
      op0 = op0 + dp[j][0];
      op1 = op1 + dp[j][1];
    }
  if (a[i]) {
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 40 / 40
• Subtask 5: 30 / 30