oj.uz

Submission #651699

# Submission time Handle Problem Language Result Execution time Memory
651699 2022-10-19T20:22:01 Z tvladm2009 The Xana coup (BOI21_xanadu) C++14
100 / 100
 87 ms 20476 KB 
#include <bits/stdc++.h>
///#pragma GCC target ("sse4.2")

///#pragma GCC optimize("O1")
///#pragma GCC optimize("O2")

///#pragma GCC optimize("O3")
///#pragma GCC optimize("Os")
///#pragma GCC optimize("Ofast")
///#pragma GCC target("avx,avx2,fma")
///#pragma GCC optimization ("unroll-loops")
///#pragma GCC target("avx2")

using namespace std;

typedef long long ll;
#define int ll

const int N = 1e5 + 7;
const int INF = 1e9;
int a[N], dp[N][2][2];
vector<int> g[N];

void dfs(int u, int p = -1) {
  int sum[2][2];
  sum[0][0] = sum[0][1] = 0;
  sum[1][0] = sum[1][1] = INF;
  for (auto &it : g[u]) {
    if (it != p) {
      dfs(it, u);
      int old[2][2];
      old[0][0] = sum[0][0];
      old[1][0] = sum[1][0];
      old[0][1] = sum[0][1];
      old[1][1] = sum[1][1];
      sum[0][0] = min({old[0][0] + dp[it][0][0], old[1][0] + dp[it][1][0], INF});
      sum[0][1] = min({old[0][1] + dp[it][0][1], old[1][1] + dp[it][1][1], INF});
      sum[1][0] = min({old[0][0] + dp[it][1][0], old[1][0] + dp[it][0][0], INF});
      sum[1][1] = min({old[0][1] + dp[it][1][1], old[1][1] + dp[it][0][1], INF});
    }
  }
  if (a[u] == 1) {
    dp[u][0][0] = sum[1][0];
    dp[u][0][1] = sum[0][0];
    dp[u][1][0] = sum[0][1] + 1;
    dp[u][1][1] = sum[1][1] + 1;
  } else {
    dp[u][0][0] = sum[0][0];
    dp[u][0][1] = sum[1][0];
    dp[u][1][0] = sum[1][1] + 1;
    dp[u][1][1] = sum[0][1] + 1;
  }
}

signed main() {
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

  int n;
  cin >> n;
  for (int i = 1; i <= n - 1; i++) {
    int x, y;
    cin >> x >> y;
    g[x].push_back(y);
    g[y].push_back(x);
  }
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  dfs(1);
  int ans = min(dp[1][0][0], dp[1][1][0]);
  if (ans == INF) {
    cout << "impossible";
    return 0;
  }
  cout << ans;
  return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2684 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2688 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 54 ms 20436 KB Output is correct
2 Correct 53 ms 20048 KB Output is correct
3 Correct 69 ms 20476 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 20280 KB Output is correct
2 Correct 76 ms 20128 KB Output is correct
3 Correct 77 ms 20356 KB Output is correct
4 Correct 75 ms 11044 KB Output is correct
5 Correct 76 ms 11664 KB Output is correct
6 Correct 84 ms 11932 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 21 ms 5588 KB Output is correct
9 Correct 75 ms 11416 KB Output is correct
10 Correct 83 ms 11648 KB Output is correct
11 Correct 75 ms 11980 KB Output is correct
12 Correct 87 ms 12280 KB Output is correct
13 Correct 68 ms 11544 KB Output is correct
14 Correct 76 ms 12128 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2684 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2688 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct
17 Correct 54 ms 20436 KB Output is correct
18 Correct 53 ms 20048 KB Output is correct
19 Correct 69 ms 20476 KB Output is correct
20 Correct 71 ms 20280 KB Output is correct
21 Correct 76 ms 20128 KB Output is correct
22 Correct 77 ms 20356 KB Output is correct
23 Correct 75 ms 11044 KB Output is correct
24 Correct 76 ms 11664 KB Output is correct
25 Correct 84 ms 11932 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 21 ms 5588 KB Output is correct
28 Correct 75 ms 11416 KB Output is correct
29 Correct 83 ms 11648 KB Output is correct
30 Correct 75 ms 11980 KB Output is correct
31 Correct 87 ms 12280 KB Output is correct
32 Correct 68 ms 11544 KB Output is correct
33 Correct 76 ms 12128 KB Output is correct
34 Correct 2 ms 2644 KB Output is correct
35 Correct 2 ms 2644 KB Output is correct
36 Correct 2 ms 2644 KB Output is correct
37 Correct 2 ms 2644 KB Output is correct
38 Correct 2 ms 2680 KB Output is correct
39 Correct 2 ms 2680 KB Output is correct
40 Correct 2 ms 2688 KB Output is correct
41 Correct 2 ms 2680 KB Output is correct
42 Correct 2 ms 2644 KB Output is correct
43 Correct 2 ms 2688 KB Output is correct
44 Correct 2 ms 2644 KB Output is correct
45 Correct 53 ms 20332 KB Output is correct
46 Correct 49 ms 20044 KB Output is correct
47 Correct 52 ms 20352 KB Output is correct
48 Correct 53 ms 10900 KB Output is correct
49 Correct 50 ms 11748 KB Output is correct
50 Correct 57 ms 11928 KB Output is correct
51 Correct 2 ms 2644 KB Output is correct
52 Correct 16 ms 5588 KB Output is correct
53 Correct 52 ms 11528 KB Output is correct
54 Correct 58 ms 11724 KB Output is correct
55 Correct 52 ms 11980 KB Output is correct
56 Correct 69 ms 12464 KB Output is correct
57 Correct 60 ms 11632 KB Output is correct
58 Correct 56 ms 12172 KB Output is correct
59 Correct 16 ms 5584 KB Output is correct
60 Correct 48 ms 10672 KB Output is correct
61 Correct 56 ms 11516 KB Output is correct
62 Correct 53 ms 11640 KB Output is correct
63 Correct 58 ms 11596 KB Output is correct
64 Correct 59 ms 11612 KB Output is correct
65 Correct 51 ms 11984 KB Output is correct
66 Correct 47 ms 12116 KB Output is correct
67 Correct 38 ms 11792 KB Output is correct
68 Correct 41 ms 11856 KB Output is correct
69 Correct 38 ms 11840 KB Output is correct
70 Correct 38 ms 11756 KB Output is correct