oj.uz

Submission #1111355

# Submission time Handle Problem Language Result Execution time Memory
1111355 2024-11-12T07:31:54 Z Zero_OP Chase (CEOI17_chase) C++14
70 / 100
 190 ms 178248 KB 
#include <bits/stdc++.h>

using namespace std;

template<typename T>
    bool maximize(T& a, const T& b){
        if(a < b){
            return a = b, true;
        } return false;
    }

const int MAX_N = 1e5 + 5;
const int MAX_K = 100 + 5;

int N, K, p[MAX_N];
long long sum_neighbor[MAX_N];
vector<int> adj[MAX_N];
long long f[MAX_N][MAX_K], g[MAX_N][MAX_K], ans;

//f[u][i] = if p[u] > 0
//g[u][i] = if p[u] = 0

void dfs(int u, int pre){
//    cout << "debug : " << u << '\n';
//    for(int i = 1; i <= K; ++i) cout << i << " - > " << f[u][i] << ' ' << g[u][i] << '\n';
    for(int v : adj[u]) if(v != pre){
        for(int i = 1; i <= K; ++i){
            f[v][i] = max(f[u][i - 1], g[u][i - 1]) - p[u] + sum_neighbor[v];
            g[v][i] = max(f[u][i], g[u][i]);
        }

        dfs(v, u);
    }

    maximize(ans, max(f[u][K], g[u][K]));
}

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

#ifdef LOCAL
    freopen("task.inp", "r", stdin);
    freopen("task.out", "w", stdout);
#endif // LOCAL

    cin >> N >> K;
    for(int i = 0; i < N; ++i) cin >> p[i];
    for(int i = 0; i < N - 1; ++i){
        int u, v;
        cin >> u >> v;
        --u, --v;
        adj[u].emplace_back(v);
        adj[v].emplace_back(u);
        sum_neighbor[u] += p[v];
        sum_neighbor[v] += p[u];
    }

    if(K == 0){
        cout << 0 << '\n';
        return 0;
    }



    for(int i = 0; i < (N <= 1000 ? N : 1); ++i){
        for(int u = 0; u < N; ++u) for(int k = 0; k < K; ++k) f[u][k] = g[u][k] = 0;
        for(int k = 1; k <= K; ++k) f[i][k] = sum_neighbor[i];
        dfs(i, -1);
    }
    cout << ans << '\n';

    return 0;
}

/*

12 2
2 3 3 8 1 5 6 7 8 3 5 4
2 1
2 7
3 4
4 7
7 6
5 6
6 8
6 9
7 10
10 11
10 12

10 2
1 9 1 9 9 1 9 1 1 1
1 2
2 3
3 4
3 5
2 6
1 7
7 8
8 9
7 10


*/

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4688 KB Output is correct
2 Correct 2 ms 4688 KB Output is correct
3 Correct 2 ms 4688 KB Output is correct
4 Correct 2 ms 4688 KB Output is correct
5 Correct 1 ms 2640 KB Output is correct
6 Correct 2 ms 4920 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4688 KB Output is correct
2 Correct 2 ms 4688 KB Output is correct
3 Correct 2 ms 4688 KB Output is correct
4 Correct 2 ms 4688 KB Output is correct
5 Correct 1 ms 2640 KB Output is correct
6 Correct 2 ms 4920 KB Output is correct
7 Correct 190 ms 9040 KB Output is correct
8 Correct 26 ms 9296 KB Output is correct
9 Correct 25 ms 9040 KB Output is correct
10 Correct 190 ms 9040 KB Output is correct
11 Correct 84 ms 9040 KB Output is correct
12 Correct 34 ms 9264 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 84 ms 175968 KB Output is correct
2 Correct 85 ms 178248 KB Output is correct
3 Correct 56 ms 173852 KB Output is correct
4 Correct 60 ms 173640 KB Output is correct
5 Correct 101 ms 173656 KB Output is correct
6 Correct 101 ms 173488 KB Output is correct
7 Correct 107 ms 173640 KB Output is correct

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4688 KB Output is correct
2 Correct 2 ms 4688 KB Output is correct
3 Correct 2 ms 4688 KB Output is correct
4 Correct 2 ms 4688 KB Output is correct
5 Correct 1 ms 2640 KB Output is correct
6 Correct 2 ms 4920 KB Output is correct
7 Correct 190 ms 9040 KB Output is correct
8 Correct 26 ms 9296 KB Output is correct
9 Correct 25 ms 9040 KB Output is correct
10 Correct 190 ms 9040 KB Output is correct
11 Correct 84 ms 9040 KB Output is correct
12 Correct 34 ms 9264 KB Output is correct
13 Correct 84 ms 175968 KB Output is correct
14 Correct 85 ms 178248 KB Output is correct
15 Correct 56 ms 173852 KB Output is correct
16 Correct 60 ms 173640 KB Output is correct
17 Correct 101 ms 173656 KB Output is correct
18 Correct 101 ms 173488 KB Output is correct
19 Correct 107 ms 173640 KB Output is correct
20 Incorrect 110 ms 173648 KB Output isn't correct
21 Halted 0 ms 0 KB -