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Submission #884921

# Submission time Handle Problem Language Result Execution time Memory
884921 2023-12-08T17:07:17 Z maxFedorchuk The Xana coup (BOI21_xanadu) C++17
100 / 100
 51 ms 15852 KB 
#include <bits/stdc++.h>
using namespace std;

const long long MX=1e5+10;

vector < long long > mas[MX];
long long st[MX];

long long mn[MX][2][2];

long long n;

void DFS(long long zar,long long mun)
{
    for(auto u:mas[zar])
    {
        if(u!=mun)
        {
            DFS(u,zar);
        }
    }

    if(st[zar])
    {
        mn[zar][0][1]=0;
        mn[zar][1][1]=n+1;

        mn[zar][0][0]=n+1;
        mn[zar][1][0]=1;
    }
    else
    {
        mn[zar][0][1]=n+1;
        mn[zar][1][1]=1;

        mn[zar][0][0]=0;
        mn[zar][1][0]=n+1;
    }

    for(auto u:mas[zar])
    {
        if(u==mun)
        {
            continue;
        }

        long long zn00=mn[zar][0][0];
        long long zn01=mn[zar][0][1];
        long long zn10=mn[zar][1][0];
        long long zn11=mn[zar][1][1];

        mn[zar][0][0]=min({zn00+mn[u][0][0],zn01+mn[u][1][0],n+1});
        mn[zar][0][1]=min({zn00+mn[u][1][0],zn01+mn[u][0][0],n+1});

        mn[zar][1][0]=min({zn10+mn[u][0][1],zn11+mn[u][1][1],n+1});
        mn[zar][1][1]=min({zn11+mn[u][0][1],zn10+mn[u][1][1],n+1});
    }

    return;
}

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

    cin>>n;

    long long a,b;
    for(long long i=1;i<n;i++)
    {
        cin>>a>>b;
        mas[a].push_back(b);
        mas[b].push_back(a);
    }

    for(long long i=1;i<=n;i++)
    {
        cin>>st[i];
    }

    DFS(1,0);

    if(min(mn[1][0][0],mn[1][1][0])>n)
    {
        cout<<"impossible\n";
    }
    else
    {
        cout<<min(mn[1][0][0],mn[1][1][0])<<"\n";
    }

    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 1 ms 4440 KB Output is correct
7 Correct 1 ms 4484 KB Output is correct
8 Correct 1 ms 4232 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 1 ms 4696 KB Output is correct
13 Correct 2 ms 4440 KB Output is correct
14 Correct 1 ms 4440 KB Output is correct
15 Correct 1 ms 4440 KB Output is correct
16 Correct 1 ms 4444 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 15600 KB Output is correct
2 Correct 32 ms 15700 KB Output is correct
3 Correct 35 ms 15696 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 32 ms 15696 KB Output is correct
2 Correct 48 ms 15720 KB Output is correct
3 Correct 32 ms 15696 KB Output is correct
4 Correct 30 ms 11344 KB Output is correct
5 Correct 51 ms 11836 KB Output is correct
6 Correct 35 ms 11860 KB Output is correct
7 Correct 2 ms 4596 KB Output is correct
8 Correct 11 ms 8188 KB Output is correct
9 Correct 51 ms 11724 KB Output is correct
10 Correct 33 ms 11604 KB Output is correct
11 Correct 33 ms 11800 KB Output is correct
12 Correct 36 ms 12016 KB Output is correct
13 Correct 32 ms 11856 KB Output is correct
14 Correct 38 ms 12112 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 1 ms 4440 KB Output is correct
7 Correct 1 ms 4484 KB Output is correct
8 Correct 1 ms 4232 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 1 ms 4696 KB Output is correct
13 Correct 2 ms 4440 KB Output is correct
14 Correct 1 ms 4440 KB Output is correct
15 Correct 1 ms 4440 KB Output is correct
16 Correct 1 ms 4444 KB Output is correct
17 Correct 33 ms 15600 KB Output is correct
18 Correct 32 ms 15700 KB Output is correct
19 Correct 35 ms 15696 KB Output is correct
20 Correct 32 ms 15696 KB Output is correct
21 Correct 48 ms 15720 KB Output is correct
22 Correct 32 ms 15696 KB Output is correct
23 Correct 30 ms 11344 KB Output is correct
24 Correct 51 ms 11836 KB Output is correct
25 Correct 35 ms 11860 KB Output is correct
26 Correct 2 ms 4596 KB Output is correct
27 Correct 11 ms 8188 KB Output is correct
28 Correct 51 ms 11724 KB Output is correct
29 Correct 33 ms 11604 KB Output is correct
30 Correct 33 ms 11800 KB Output is correct
31 Correct 36 ms 12016 KB Output is correct
32 Correct 32 ms 11856 KB Output is correct
33 Correct 38 ms 12112 KB Output is correct
34 Correct 1 ms 4440 KB Output is correct
35 Correct 1 ms 4444 KB Output is correct
36 Correct 1 ms 4444 KB Output is correct
37 Correct 1 ms 4444 KB Output is correct
38 Correct 1 ms 4444 KB Output is correct
39 Correct 2 ms 4444 KB Output is correct
40 Correct 1 ms 4488 KB Output is correct
41 Correct 1 ms 4444 KB Output is correct
42 Correct 1 ms 4444 KB Output is correct
43 Correct 1 ms 4440 KB Output is correct
44 Correct 1 ms 4696 KB Output is correct
45 Correct 31 ms 15760 KB Output is correct
46 Correct 31 ms 15708 KB Output is correct
47 Correct 45 ms 15852 KB Output is correct
48 Correct 32 ms 11356 KB Output is correct
49 Correct 35 ms 11888 KB Output is correct
50 Correct 38 ms 11860 KB Output is correct
51 Correct 1 ms 4440 KB Output is correct
52 Correct 11 ms 8284 KB Output is correct
53 Correct 37 ms 11604 KB Output is correct
54 Correct 40 ms 11860 KB Output is correct
55 Correct 31 ms 11868 KB Output is correct
56 Correct 33 ms 11856 KB Output is correct
57 Correct 32 ms 11864 KB Output is correct
58 Correct 32 ms 12376 KB Output is correct
59 Correct 13 ms 8284 KB Output is correct
60 Correct 30 ms 11088 KB Output is correct
61 Correct 32 ms 11612 KB Output is correct
62 Correct 32 ms 11756 KB Output is correct
63 Correct 31 ms 11548 KB Output is correct
64 Correct 41 ms 11600 KB Output is correct
65 Correct 30 ms 12012 KB Output is correct
66 Correct 28 ms 12116 KB Output is correct
67 Correct 26 ms 11976 KB Output is correct
68 Correct 26 ms 11976 KB Output is correct
69 Correct 26 ms 11984 KB Output is correct
70 Correct 36 ms 11956 KB Output is correct