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Submission #942780

# Submission time Handle Problem Language Result Execution time Memory
942780 2024-03-11T04:37:44 Z Darren0724 The Xana coup (BOI21_xanadu) C++17
100 / 100
 68 ms 33896 KB 
#include <bits/stdc++.h>
using namespace std;
#define LCBorz ios_base::sync_with_stdio(false); cin.tie(0);
#define int long long
#define all(x) x.begin(), x.end()
#define endl '\n'
const int N=200005;
const int INF=1e9;
vector<int> adj[N];
vector dp(4,vector<int>(N,INF));
vector v(N,0);
void dfs(int k,int pa){
    vector<int> dp0,dp1;
    int t0=0,t1=0;
    for(int j:adj[k]){
        if(j==pa)continue;
        dfs(j,k);
        t0+=dp[0][j];
        dp0.push_back({dp[1][j]-dp[0][j]});
        t1+=dp[2][j];
        dp1.push_back({dp[3][j]-dp[2][j]});
    }
    sort(all(dp0));
    sort(all(dp1));
    int now=v[k]*2;
    dp[now][k]=min(dp[now][k],t0);
    for(int j:dp0){
        now^=2;
        t0+=j;
        dp[now][k]=min(dp[now][k],t0);
    }
    now=(v[k]^1)*2+1;
    dp[now][k]=min(dp[now][k],t1+1);
    for(int j:dp1){
        now^=2;
        t1+=j;
        dp[now][k]=min(dp[now][k],t1+1);
    }
}
// change to 0 
int32_t main() {
    LCBorz;
    int n;cin>>n;
    for(int i=1;i<n;i++){
        int a,b;cin>>a>>b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    for(int i=1;i<=n;i++){
        cin>>v[i];
    }
    dfs(1,1);
    int ans=min(dp[0][1],dp[1][1]);
    if(ans==INF){
        cout<<"impossible"<<endl;
    }
    else{
        cout<<ans<<endl;
    }
    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 12888 KB Output is correct
2 Correct 5 ms 12860 KB Output is correct
3 Correct 6 ms 12728 KB Output is correct
4 Correct 6 ms 12892 KB Output is correct
5 Correct 7 ms 12888 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 12888 KB Output is correct
2 Correct 5 ms 12860 KB Output is correct
3 Correct 6 ms 12728 KB Output is correct
4 Correct 6 ms 12892 KB Output is correct
5 Correct 7 ms 12888 KB Output is correct
6 Correct 5 ms 12892 KB Output is correct
7 Correct 5 ms 12892 KB Output is correct
8 Correct 5 ms 12892 KB Output is correct
9 Correct 5 ms 12892 KB Output is correct
10 Correct 5 ms 12768 KB Output is correct
11 Correct 5 ms 12892 KB Output is correct
12 Correct 5 ms 12892 KB Output is correct
13 Correct 5 ms 12964 KB Output is correct
14 Correct 5 ms 12892 KB Output is correct
15 Correct 6 ms 12892 KB Output is correct
16 Correct 5 ms 12892 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 48 ms 33776 KB Output is correct
2 Correct 49 ms 33332 KB Output is correct
3 Correct 50 ms 33696 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 66 ms 33780 KB Output is correct
2 Correct 47 ms 33340 KB Output is correct
3 Correct 52 ms 33844 KB Output is correct
4 Correct 42 ms 16980 KB Output is correct
5 Correct 47 ms 17276 KB Output is correct
6 Correct 52 ms 17428 KB Output is correct
7 Correct 6 ms 12888 KB Output is correct
8 Correct 18 ms 14020 KB Output is correct
9 Correct 45 ms 17204 KB Output is correct
10 Correct 47 ms 17204 KB Output is correct
11 Correct 47 ms 18560 KB Output is correct
12 Correct 60 ms 18832 KB Output is correct
13 Correct 63 ms 17428 KB Output is correct
14 Correct 55 ms 17724 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 12888 KB Output is correct
2 Correct 5 ms 12860 KB Output is correct
3 Correct 6 ms 12728 KB Output is correct
4 Correct 6 ms 12892 KB Output is correct
5 Correct 7 ms 12888 KB Output is correct
6 Correct 5 ms 12892 KB Output is correct
7 Correct 5 ms 12892 KB Output is correct
8 Correct 5 ms 12892 KB Output is correct
9 Correct 5 ms 12892 KB Output is correct
10 Correct 5 ms 12768 KB Output is correct
11 Correct 5 ms 12892 KB Output is correct
12 Correct 5 ms 12892 KB Output is correct
13 Correct 5 ms 12964 KB Output is correct
14 Correct 5 ms 12892 KB Output is correct
15 Correct 6 ms 12892 KB Output is correct
16 Correct 5 ms 12892 KB Output is correct
17 Correct 48 ms 33776 KB Output is correct
18 Correct 49 ms 33332 KB Output is correct
19 Correct 50 ms 33696 KB Output is correct
20 Correct 66 ms 33780 KB Output is correct
21 Correct 47 ms 33340 KB Output is correct
22 Correct 52 ms 33844 KB Output is correct
23 Correct 42 ms 16980 KB Output is correct
24 Correct 47 ms 17276 KB Output is correct
25 Correct 52 ms 17428 KB Output is correct
26 Correct 6 ms 12888 KB Output is correct
27 Correct 18 ms 14020 KB Output is correct
28 Correct 45 ms 17204 KB Output is correct
29 Correct 47 ms 17204 KB Output is correct
30 Correct 47 ms 18560 KB Output is correct
31 Correct 60 ms 18832 KB Output is correct
32 Correct 63 ms 17428 KB Output is correct
33 Correct 55 ms 17724 KB Output is correct
34 Correct 5 ms 12892 KB Output is correct
35 Correct 5 ms 12892 KB Output is correct
36 Correct 5 ms 12892 KB Output is correct
37 Correct 5 ms 12892 KB Output is correct
38 Correct 5 ms 12892 KB Output is correct
39 Correct 5 ms 12892 KB Output is correct
40 Correct 5 ms 12892 KB Output is correct
41 Correct 5 ms 12892 KB Output is correct
42 Correct 5 ms 12936 KB Output is correct
43 Correct 5 ms 12892 KB Output is correct
44 Correct 5 ms 12924 KB Output is correct
45 Correct 65 ms 33584 KB Output is correct
46 Correct 54 ms 33596 KB Output is correct
47 Correct 53 ms 33896 KB Output is correct
48 Correct 47 ms 16944 KB Output is correct
49 Correct 48 ms 17456 KB Output is correct
50 Correct 47 ms 17472 KB Output is correct
51 Correct 5 ms 12888 KB Output is correct
52 Correct 18 ms 13884 KB Output is correct
53 Correct 50 ms 17296 KB Output is correct
54 Correct 62 ms 17372 KB Output is correct
55 Correct 46 ms 18484 KB Output is correct
56 Correct 47 ms 18620 KB Output is correct
57 Correct 44 ms 17472 KB Output is correct
58 Correct 68 ms 17868 KB Output is correct
59 Correct 18 ms 13884 KB Output is correct
60 Correct 43 ms 16692 KB Output is correct
61 Correct 46 ms 17200 KB Output is correct
62 Correct 47 ms 17208 KB Output is correct
63 Correct 48 ms 17344 KB Output is correct
64 Correct 47 ms 17216 KB Output is correct
65 Correct 41 ms 17732 KB Output is correct
66 Correct 43 ms 17720 KB Output is correct
67 Correct 38 ms 20360 KB Output is correct
68 Correct 38 ms 20332 KB Output is correct
69 Correct 37 ms 20284 KB Output is correct
70 Correct 37 ms 20292 KB Output is correct