Submission #866946

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
866946	2023-10-27 12:46:21	Mizo_Compiler	The Xana coup (BOI21_xanadu)	C++17	100 / 100	55 ms	21600 KiB

xanadu

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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef double ld;
#define pb push_back
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define F first
#define S second
const int N = 1e5+5;
int n, a[N];
vector<int> adj[N];
ll dp[N][2][2];
ll sol(int u, int pv, int nv, int par) {
  ll &ret = dp[u][pv][nv];
  if (~ret)return ret;
  int cur = (a[u] ^ pv ^ nv);
  if (!cur) {
    ll mn = n+1;
    bool c = 0;
    ret = nv;
    for (auto &v : adj[u]) {
      if (v == par)continue;
      ll f = sol(v, nv, 0, u), s = sol(v, nv, 1, u);
      mn = min(mn, abs(f-s));
      ret += min(f, s);
      if (s < f)c ^= 1;
    }
    if (c)ret += mn;
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 40 / 40
• Subtask 5: 30 / 30