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Submission #960993

# Submission time Handle Problem Language Result Execution time Memory
960993 2024-04-11T10:50:29 Z Gr1sen The Xana coup (BOI21_xanadu) C++17
100 / 100
 85 ms 17004 KB 
#include<iostream>
#include<vector>
#include<algorithm>
#include<iomanip>

using namespace std;

#define vi vector<int>
#define vvi vector<vi>

int inf = 1e8;

struct point {
    int a = inf, b = inf, c = inf, d = inf; // no flip on, flip on, no flip off, flip off
};

vi O;
vvi Adj;

point oink(int p, int dfp) {
    if (Adj[p].size() == 1 && Adj[p][0] == dfp) {
        if (O[p]) return {0, inf, inf, 1};
        return {inf, 1, 0, inf};
    }
    bool q = 1;
    point l;
    for (auto i : Adj[p]) { 
        if (i == dfp) continue;
        point o = oink(i, p);
        //cerr << "o: " << o.a << ", " << o.b << ", " << o.c << ", " << o.d << "; p:" << i+1 << endl;
        if (q) {
            l = o;
            q = 0;
            continue;
        }
        point ln;
        ln.a = min(min(l.a + o.a, l.b + o.b), inf);
        ln.b = min(min(l.a + o.b, l.b + o.a), inf);
        ln.c = min(min(l.c + o.c, l.d + o.d), inf);
        ln.d = min(min(l.c + o.d, l.d + o.c), inf);
        l = ln;
    }
    //cerr << l.a << " " << l.b << " " << l.c << " " << l.d << "; p: " << p+1 << "; dfp: " << dfp+1 << endl;
    if (O[p]) return {l.c, l.b+1, l.d, l.a+1};
    return {l.d, l.a+1, l.c, l.b+1};
}

int main() {
    ios::sync_with_stdio(); cin.tie(0);
    int n; cin >> n;
    Adj.resize(n);
    for (int i = 0; i < n-1; i++) {
        int a, b; cin >> a >> b; a--; b--;
        Adj[a].push_back(b);
        Adj[b].push_back(a);
    }
    O.resize(n);
    for (auto &i : O) cin >> i;
    point ans = oink(0, -1);
    int a = min(ans.c, ans.d);
    if (a >= inf) cout << "impossible\n";
    else cout << a << "\n";
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 428 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 67 ms 16768 KB Output is correct
2 Correct 71 ms 16732 KB Output is correct
3 Correct 67 ms 16852 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 16836 KB Output is correct
2 Correct 69 ms 16524 KB Output is correct
3 Correct 72 ms 17004 KB Output is correct
4 Correct 57 ms 6868 KB Output is correct
5 Correct 63 ms 7492 KB Output is correct
6 Correct 66 ms 7504 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 25 ms 3072 KB Output is correct
9 Correct 75 ms 7492 KB Output is correct
10 Correct 75 ms 7704 KB Output is correct
11 Correct 64 ms 8016 KB Output is correct
12 Correct 74 ms 8276 KB Output is correct
13 Correct 61 ms 7156 KB Output is correct
14 Correct 63 ms 7520 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 428 KB Output is correct
17 Correct 67 ms 16768 KB Output is correct
18 Correct 71 ms 16732 KB Output is correct
19 Correct 67 ms 16852 KB Output is correct
20 Correct 73 ms 16836 KB Output is correct
21 Correct 69 ms 16524 KB Output is correct
22 Correct 72 ms 17004 KB Output is correct
23 Correct 57 ms 6868 KB Output is correct
24 Correct 63 ms 7492 KB Output is correct
25 Correct 66 ms 7504 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 25 ms 3072 KB Output is correct
28 Correct 75 ms 7492 KB Output is correct
29 Correct 75 ms 7704 KB Output is correct
30 Correct 64 ms 8016 KB Output is correct
31 Correct 74 ms 8276 KB Output is correct
32 Correct 61 ms 7156 KB Output is correct
33 Correct 63 ms 7520 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 0 ms 388 KB Output is correct
36 Correct 0 ms 348 KB Output is correct
37 Correct 1 ms 596 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 1 ms 348 KB Output is correct
40 Correct 0 ms 348 KB Output is correct
41 Correct 0 ms 348 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 0 ms 356 KB Output is correct
44 Correct 0 ms 348 KB Output is correct
45 Correct 69 ms 16760 KB Output is correct
46 Correct 67 ms 16564 KB Output is correct
47 Correct 67 ms 16984 KB Output is correct
48 Correct 55 ms 6744 KB Output is correct
49 Correct 72 ms 7508 KB Output is correct
50 Correct 85 ms 7636 KB Output is correct
51 Correct 1 ms 344 KB Output is correct
52 Correct 21 ms 2904 KB Output is correct
53 Correct 69 ms 7512 KB Output is correct
54 Correct 63 ms 7744 KB Output is correct
55 Correct 71 ms 8016 KB Output is correct
56 Correct 67 ms 8512 KB Output is correct
57 Correct 59 ms 7184 KB Output is correct
58 Correct 69 ms 7640 KB Output is correct
59 Correct 24 ms 2824 KB Output is correct
60 Correct 64 ms 6776 KB Output is correct
61 Correct 84 ms 7536 KB Output is correct
62 Correct 63 ms 7508 KB Output is correct
63 Correct 64 ms 7540 KB Output is correct
64 Correct 62 ms 7672 KB Output is correct
65 Correct 69 ms 8200 KB Output is correct
66 Correct 58 ms 8028 KB Output is correct
67 Correct 57 ms 8044 KB Output is correct
68 Correct 56 ms 7812 KB Output is correct
69 Correct 56 ms 7880 KB Output is correct
70 Correct 70 ms 7880 KB Output is correct