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Submission #659986

# Submission time Handle Problem Language Result Execution time Memory
659986 2022-11-20T07:19:22 Z Mahdi The Xana coup (BOI21_xanadu) C++17
100 / 100
 135 ms 26536 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
const int N=1e5+5;
int n, r[N];
ll a[N], b[N], c[N], d[N];
vector<int>g[N];

void dfs(const int &v, const int &p=-1){
    b[v]=d[v]=1;
    vector<int>x, y;
    for(int u: g[v]){
        if(u!=p){
            dfs(u, v);
            a[v]+=a[u];
            c[v]+=a[u];
            x.push_back(b[u]-a[u]);
            b[v]+=c[u];
            d[v]+=c[u];
            y.push_back(d[u]-c[u]);
        }
    }
    sort(x.begin(), x.end());
    sort(y.begin(), y.end());
    ll aa=1e18, bb=1e18, cc=1e18, dd=1e18;
    if(r[v]){
        aa=0;
        dd=0;
    }
    else{
        bb=0;
        cc=0;
    }
    ll sm=0;
    bool h=r[v];
    for(int u: x){
        sm+=u;
        if(h)
            cc=min(cc, sm);
        else
            aa=min(aa, sm);
        h=!h;
    }
    h=r[v];
    sm=0;
    for(int u: y){
        sm+=u;
        if(h)
            bb=min(bb, sm);
        else
            dd=min(dd, sm);
        h=!h;
    }
    a[v]+=aa;
    b[v]+=bb;
    c[v]+=cc;
    d[v]+=dd;
    ll zz=1e9;
    a[v]=min(a[v], zz);
    b[v]=min(b[v], zz);
    c[v]=min(c[v], zz);
    d[v]=min(d[v], zz);
}

int main(){
    cin>>n;
    for(int i=1;i<n;++i){
        int u, v;
        cin>>u>>v;
        g[--u].push_back(--v);
        g[v].push_back(u);
    }
    for(int i=0;i<n;++i){
        cin>>r[i];
        r[i]=1-r[i];
    }
    dfs(0);
    int z=min(a[0], b[0]);
    if(z>n)
        cout<<"impossible\n";
    else
        cout<<z<<'\n';
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 1 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 1 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 1 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 1 ms 2644 KB Output is correct
7 Correct 1 ms 2644 KB Output is correct
8 Correct 1 ms 2644 KB Output is correct
9 Correct 1 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 1 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 1 ms 2644 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 107 ms 26304 KB Output is correct
2 Correct 105 ms 26036 KB Output is correct
3 Correct 106 ms 26460 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 26316 KB Output is correct
2 Correct 103 ms 26112 KB Output is correct
3 Correct 135 ms 26536 KB Output is correct
4 Correct 105 ms 8592 KB Output is correct
5 Correct 105 ms 9160 KB Output is correct
6 Correct 119 ms 9328 KB Output is correct
7 Correct 2 ms 2620 KB Output is correct
8 Correct 43 ms 4996 KB Output is correct
9 Correct 123 ms 9336 KB Output is correct
10 Correct 111 ms 9448 KB Output is correct
11 Correct 110 ms 10732 KB Output is correct
12 Correct 116 ms 11132 KB Output is correct
13 Correct 95 ms 8840 KB Output is correct
14 Correct 100 ms 9292 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 1 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 1 ms 2644 KB Output is correct
7 Correct 1 ms 2644 KB Output is correct
8 Correct 1 ms 2644 KB Output is correct
9 Correct 1 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 1 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 1 ms 2644 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct
17 Correct 107 ms 26304 KB Output is correct
18 Correct 105 ms 26036 KB Output is correct
19 Correct 106 ms 26460 KB Output is correct
20 Correct 110 ms 26316 KB Output is correct
21 Correct 103 ms 26112 KB Output is correct
22 Correct 135 ms 26536 KB Output is correct
23 Correct 105 ms 8592 KB Output is correct
24 Correct 105 ms 9160 KB Output is correct
25 Correct 119 ms 9328 KB Output is correct
26 Correct 2 ms 2620 KB Output is correct
27 Correct 43 ms 4996 KB Output is correct
28 Correct 123 ms 9336 KB Output is correct
29 Correct 111 ms 9448 KB Output is correct
30 Correct 110 ms 10732 KB Output is correct
31 Correct 116 ms 11132 KB Output is correct
32 Correct 95 ms 8840 KB Output is correct
33 Correct 100 ms 9292 KB Output is correct
34 Correct 2 ms 2644 KB Output is correct
35 Correct 1 ms 2644 KB Output is correct
36 Correct 1 ms 2644 KB Output is correct
37 Correct 1 ms 2644 KB Output is correct
38 Correct 1 ms 2644 KB Output is correct
39 Correct 2 ms 2644 KB Output is correct
40 Correct 1 ms 2644 KB Output is correct
41 Correct 2 ms 2644 KB Output is correct
42 Correct 1 ms 2644 KB Output is correct
43 Correct 1 ms 2644 KB Output is correct
44 Correct 2 ms 2644 KB Output is correct
45 Correct 111 ms 26372 KB Output is correct
46 Correct 111 ms 26160 KB Output is correct
47 Correct 102 ms 26472 KB Output is correct
48 Correct 108 ms 8588 KB Output is correct
49 Correct 104 ms 9180 KB Output is correct
50 Correct 122 ms 9356 KB Output is correct
51 Correct 2 ms 2644 KB Output is correct
52 Correct 34 ms 4992 KB Output is correct
53 Correct 109 ms 9368 KB Output is correct
54 Correct 113 ms 9548 KB Output is correct
55 Correct 115 ms 10824 KB Output is correct
56 Correct 115 ms 11072 KB Output is correct
57 Correct 94 ms 8892 KB Output is correct
58 Correct 102 ms 9284 KB Output is correct
59 Correct 30 ms 4936 KB Output is correct
60 Correct 89 ms 8616 KB Output is correct
61 Correct 111 ms 9260 KB Output is correct
62 Correct 124 ms 9424 KB Output is correct
63 Correct 113 ms 9380 KB Output is correct
64 Correct 99 ms 9420 KB Output is correct
65 Correct 90 ms 9788 KB Output is correct
66 Correct 91 ms 9808 KB Output is correct
67 Correct 92 ms 10824 KB Output is correct
68 Correct 85 ms 10820 KB Output is correct
69 Correct 84 ms 10828 KB Output is correct
70 Correct 83 ms 10900 KB Output is correct