Submission #404004

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
404004	2021-05-13 16:44:09	Nordway	The Xana coup (BOI21_xanadu)	C++17	100 / 100	151 ms	15096 KiB

xanadu

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#include <iostream>
#include <vector>
#define pb push_back
using namespace std;
const int N = 1e5 + 1;
const int inf = 1e9;
bool turned[N];
vector <int> g[N];
int dp[N][2][2], tmp[2][2];
void dfs(int v, int p) {
  for (int to : g[v]) {
    if (to != p) {
      dfs(to, v);
    }
  }
  dp[v][turned[v]][0] = 0;
  dp[v][turned[v]][1] = inf;
  dp[v][1 ^ turned[v]][1] = 1;
  dp[v][1 ^ turned[v]][0] = inf;
  for (int to : g[v]) {
    if (to != p) {
      tmp[0][0] = min(tmp[0][0], dp[v][0][0] + dp[to][0][0]);
      tmp[0][0] = min(tmp[0][0], dp[v][1][0] + dp[to][0][1]);
      tmp[0][1] = min(tmp[0][1], dp[v][0][1] + dp[to][1][0]);
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 40 / 40
• Subtask 5: 30 / 30